Remove libmetricslogger_static

In aosp/790068, libmetricslogger is converted from cc_library_shared to
cc_library so there's no reason to keep both libmetricslogger and
libmetricslogger_static. All necessary dependencies are now cleaned up
therefore this can now be removed.

Change-Id: I09808d71771ac032f8b2b2d71944721fb03d3575
Fixes: 117829226
Test: compiles without failures