Fix binder force gc will block binder thread

Symptom: Force gc caused activity launch time took longer
Root Cause: Runtime.getRuntime().gc will block binder thread
Solution: Use VMRuntime.requestConcurrentGC() will not block binder
thread

(cherry pick commit d916c233f0ed615667c1c2338c779e819098d135)

Bug: 20554807
Change-Id: Ia9fecea51d2b0a6635e037b5f2bfcb8eb87f4103
1 file changed