sensorhal: protect mWakeEventCount with lock and handle mRing full

Bug: 62513931
Test: build/enable prox, trigger prox, verify wakelock not stuck on
Change-Id: I29d734d404d982b9c6bca445a91c7f9bc7a65f40
Signed-off-by: Ben Fennema <fennema@google.com>
3 files changed