add sepolicy for sendhint utility for sending hint am: 37f617ed50

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/google/pixel-sepolicy/+/21522134

Change-Id: I05589f8f6e9c60b0ccd6935f12a34a270e15aacf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>