Move pgo rules to afdo am: df8cb36848 am: 4d6015ea46 am: bc6206f417 am: f18492cbae

Original change: https://android-review.googlesource.com/c/platform/external/libcxx/+/1936029

Change-Id: I10e8d29fe36532cd5e538f5b94af75f8e1075351
diff --git a/Android.bp b/Android.bp
index bbb3d8d..2fd04d3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -164,16 +164,9 @@
     whole_static_libs: ["libc++_static"],
     stl: "none",
 
-    pgo: {
-        sampling: true,
-    },
+    afdo: true,
 
     target: {
-        android: {
-            pgo: {
-                profile_file: "libc++/libc++.profdata",
-            },
-        },
         darwin: {
             unexported_symbols_list: "lib/libc++unexp.exp",
             force_symbols_not_weak_list: "lib/notweak.exp",