Replace #apex with #systemapi

Currently, for an API symbol to be accessible to APEXes, it needs to be
marked as either # systemapi or # apex. It was originally just # apex,
but we added # systemapi to clearly identify the origin of the APIs.

The intended use is

* #apex is for APEX-visible symbols that are defined in an APEX
* #systemapi is for APEX-visible symbols that are defined in the
  platform (the non-updatable part)

This intention is documented build/soong/docs/map_files.md, but isn't
enforced at all.

With b/239274367, this is now enforced and therefore the #apex tags in
the platform library are replaced with `#systemapi`

This change does not alter any functionality.

Bug: 239274367
Test: m
Change-Id: I2aca12a4caba61975a612e6e749fc58e496030dd
diff --git a/liblog/liblog.map.txt b/liblog/liblog.map.txt
index f8d5ef0..440e7df 100644
--- a/liblog/liblog.map.txt
+++ b/liblog/liblog.map.txt
@@ -1,6 +1,6 @@
 LIBLOG {
   global:
-    android_name_to_log_id; # apex llndk
+    android_name_to_log_id; # systemapi llndk
     android_log_id_to_name; # llndk
     __android_log_assert;
     __android_log_buf_print;
@@ -19,12 +19,12 @@
     android_logger_get_log_readable_size; # llndk
     android_logger_get_log_version; # llndk
     android_logger_get_log_size; # llndk
-    android_logger_list_alloc; # apex llndk
-    android_logger_list_alloc_time; # apex llndk
-    android_logger_list_free; # apex llndk
-    android_logger_list_open; # apex llndk
-    android_logger_list_read; # apex llndk
-    android_logger_open; # apex llndk
+    android_logger_list_alloc; # systemapi llndk
+    android_logger_list_alloc_time; # systemapi llndk
+    android_logger_list_free; # systemapi llndk
+    android_logger_list_open; # systemapi llndk
+    android_logger_list_read; # systemapi llndk
+    android_logger_open; # systemapi llndk
     android_logger_set_log_size; # llndk
 };
 
@@ -33,34 +33,34 @@
     android_logger_get_prune_list; # llndk
     android_logger_set_prune_list; # llndk
     android_logger_get_statistics; # llndk
-    __android_log_error_write; # apex llndk
+    __android_log_error_write; # systemapi llndk
     __android_log_is_loggable;
-    create_android_logger; # apex llndk
-    android_log_destroy; # apex llndk
-    android_log_write_list_begin; # apex llndk
-    android_log_write_list_end; # apex llndk
-    android_log_write_int32; # apex llndk
-    android_log_write_int64; # apex llndk
-    android_log_write_string8; # apex llndk
-    android_log_write_string8_len; # apex llndk
-    android_log_write_float32; # apex llndk
-    android_log_write_list; # apex llndk
+    create_android_logger; # systemapi llndk
+    android_log_destroy; # systemapi llndk
+    android_log_write_list_begin; # systemapi llndk
+    android_log_write_list_end; # systemapi llndk
+    android_log_write_int32; # systemapi llndk
+    android_log_write_int64; # systemapi llndk
+    android_log_write_string8; # systemapi llndk
+    android_log_write_string8_len; # systemapi llndk
+    android_log_write_float32; # systemapi llndk
+    android_log_write_list; # systemapi llndk
 
 };
 
 LIBLOG_O {
   global:
     __android_log_is_loggable_len;
-    __android_log_is_debuggable; # apex llndk
+    __android_log_is_debuggable; # systemapi llndk
 };
 
 LIBLOG_Q { # introduced=29
   global:
-    __android_log_bswrite; # apex
-    __android_log_btwrite; # apex
-    __android_log_bwrite; # apex
-    __android_log_close; # apex
-    __android_log_security; # apex
+    __android_log_bswrite; # systemapi
+    __android_log_btwrite; # systemapi
+    __android_log_bwrite; # systemapi
+    __android_log_close; # systemapi
+    __android_log_security; # systemapi
     android_log_reset; # llndk
     android_log_parser_reset; # llndk
 };
@@ -71,7 +71,7 @@
     __android_log_default_aborter;
     __android_log_get_minimum_priority;
     __android_log_logd_logger;
-    __android_log_security_bswrite; # apex
+    __android_log_security_bswrite; # systemapi
     __android_log_set_aborter;
     __android_log_set_default_tag;
     __android_log_set_logger;