Move default tag from libbase to liblog

Bug: 119867234
Test: log tags look right, libbase/liblog unit tests
Change-Id: I3670c3fdce3d0238a23a53bba2877ffed1291f9c
diff --git a/liblog/liblog.map.txt b/liblog/liblog.map.txt
index 62b9805..198cdae 100644
--- a/liblog/liblog.map.txt
+++ b/liblog/liblog.map.txt
@@ -73,6 +73,7 @@
     __android_log_logd_logger;
     __android_log_security_bswrite; # apex
     __android_log_set_aborter;
+    __android_log_set_default_tag;
     __android_log_set_logger;
     __android_log_set_minimum_priority;
     __android_log_stderr_logger;