Exempt callingUid that has START_ACTIVITIES_FROM_BACKGROUND
permission.

From background FGS while-in-use permission restriction.

Bug: 149835015, 136219221
Test: adb shell dumpsys activity -a
Change-Id: I1a23689a2939d15101a1d8bb21a85fc9a9cca31f
(cherry picked from commit d731201cac67f925a324aec8662ae907d90deedd)
1 file changed