Revert "Mark libmetricslogger vendor_available."

This reverts commit 7f96d493705dd00757597018e6befa20b15bfc8b.

Reason for revert: depends on private liblog APIs
- log/log_event_list.h is not in the vndk

Change-Id: I448c2f1059bd6b225d8efff87eb3948e931de47a
1 file changed