Fix implicit-fallthrough warnings. DO NOT MERGE.

These changes are not needed in goog/master.

Test: make checkbuild
Bug: 112564944
Change-Id: I02d5cdaacecf06994f6c26328533eccf511009bb
(cherry picked from commit 03ef7ffc93)
Exempt-From-Owner-Approval: do not block on new warnings

media/libmediaplayer2/nuplayer2/NuPlayer2Driver.cpp

@@ -327,7 +327,7 @@ status_t NuPlayer2Driver::stop() {
     switch (mState) {
         case STATE_RUNNING:
             mPlayer->pause();
-            // fall through
+            [[fallthrough]];
 
         case STATE_PAUSED:
             mState = STATE_STOPPED;