Allow protected broadcasts in tests

SysUI must send protected broadcasts to avoid system impersonation.
Our tests should also allow these types of broadcasts, otherwise
they will be dropped/skipped on -user builds and functionality
will be broken.

This CL also protects the flashlight broadcast.

Fixes: 110825884
Test: atest com.android.systemui.qs.external.TileServicesTest
Change-Id: I5a3dfc569c1695366e5f0e48cda8a7a32e287e7d