Merge "Change callback argument to boolean." am: 3f90a7e59e am: 53dcdd11eb

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/1555798

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I586eabdfa611e97f6e430ca5550b582a3faef0fd