Don't disable all sanitizers in liblog, just asan.

ASan runtime library depends on liblog, so we have to disable ASan,
but nothing else.

Bug: 33091541
Test: SANITIZE_TARGET=address keeps working
Change-Id: I6e22925b7f1d5ec86fe1bd8c00dba4c3e86ddf3f
diff --git a/liblog/Android.bp b/liblog/Android.bp
index bbe7d79..40cdcee 100644
--- a/liblog/Android.bp
+++ b/liblog/Android.bp
@@ -57,7 +57,7 @@
             srcs: liblog_target_sources,
             // AddressSanitizer runtime library depends on liblog.
             sanitize: {
-                never: true,
+                address: false,
             },
         },
         android_arm: {