Use target.linux for all linux kernel based targets

Now in Android.bp files, target.linux applies to all targets running a
linux kernel (android, linux_glibc, linux_bionic). So common
flags/sources/etc can be combined instead of copying them to each
target.

Test: m
Change-Id: I45c7b44cda6399ac0f6754e14aa2df1a539838f0
diff --git a/Android.bp b/Android.bp
index 37b6f50..a7d74e3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -16,12 +16,7 @@
     export_include_dirs: ["."],
 
     target: {
-        linux_glibc: {
-            sanitize: {
-                misc_undefined: ["integer"],
-            },
-        },
-        android: {
+        linux: {
             sanitize: {
                 misc_undefined: ["integer"],
             },