Treat MODE_FOREGROUND as ALLOWED for appop checks

noteOp always resolved MODE_FOREGROUND into IGNORED/ALLOWED
checkOp resolves it too, but checkOpRaw does not resolved it and might
return it.

Preflight checks should be independant of the uid state, hence treat
MODE_FOREGROUND similar to ALLOWED as MODE_FOREGROUND might allow it.

Bug: 150508177
Fixes: 148197098
Test: TH
Change-Id: I7b4f53c7ce638f92747d452f2d2f72d098e94b78