Merge "Change callback argument to boolean." am: 3f90a7e59e am: 53dcdd11eb am: bbe9622787

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Id592f3b843fec7c91b8d3e1e871a7418c0571e78