liblog: remove visibility macros

Visibility is managed through version scripts now.

Bug: 123349183
Test: build
Change-Id: Ia388611a2ec14d0ff9c3896cfe97ccdce17dbb8b
diff --git a/liblog/config_write.h b/liblog/config_write.h
index e3be445..a901f13 100644
--- a/liblog/config_write.h
+++ b/liblog/config_write.h
@@ -22,8 +22,8 @@
 
 __BEGIN_DECLS
 
-extern LIBLOG_HIDDEN struct listnode __android_log_transport_write;
-extern LIBLOG_HIDDEN struct listnode __android_log_persist_write;
+extern struct listnode __android_log_transport_write;
+extern struct listnode __android_log_persist_write;
 
 #define write_transport_for_each(transp, transports)                           \
   for ((transp) = node_to_item((transports)->next,                             \
@@ -46,7 +46,7 @@
        (transp) = node_to_item((n), struct android_log_transport_write, node), \
       (n) = (transp)->node.next)
 
-LIBLOG_HIDDEN void __android_log_config_write();
-LIBLOG_HIDDEN void __android_log_config_write_close();
+void __android_log_config_write();
+void __android_log_config_write_close();
 
 __END_DECLS