Restrict halfsheet cancel broadcast

Bug: 234442700
Test: atest: NearbyUnitTest
Tag: #security
Ignore-AOSP-First: Security
Change-Id: I7d7606e40928cb6cd2ed9c022b2375012baec1d6
(cherry picked from commit be99ea27e22ef97aec9a95ba6d5f52e954e9f2a7)
Merged-In: I7d7606e40928cb6cd2ed9c022b2375012baec1d6
2 files changed