SuspendSepolicyTests: Use target device grep am: 42f7e8dc09

Original change: https://android-review.googlesource.com/c/platform/system/hardware/interfaces/+/3393122

Change-Id: I3cdc9ecdee9a8982740d07902e65649ff648318e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>