Change SANITIZE_TARGET refs from 'coverage' to 'fuzzer'.

Cleanup of references to 'coverage' in build files. Part of a larger
cleanup to make fuzzing work again in the Android build tree.

Also fixed a test issue with emulated TLS with the new changes, and
removed libc.so fuzzer support until a linked bug is fixed
(b/132640749).

Bug: 121042685
Test: With all patches in the bug merged: mmma bionic
Change-Id: I592352fe9210ff811a2660a88cbbfe48d70a1e57
Merged-In: I592352fe9210ff811a2660a88cbbfe48d70a1e57
diff --git a/libc/Android.bp b/libc/Android.bp
index 570e785..7d08365 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -73,6 +73,8 @@
     sanitize: {
         address: false,
         integer_overflow: false,
+        // TODO(b/132640749): Fix broken fuzzer support.
+        fuzzer: false,
     },
     native_coverage: false,
     recovery_available: true,