The ability to start FGS can be passed down by service binding.

1. Add field mAllowStartFgs in ProcessRecord to indicate this app can
start FGS.
2. mAllowStartFgs is true if the process has
  * any of these permissions: START_ACTIVITIES_FROM_BACKGROUND,
START_FOREGROUND_SERVICES_FROM_BACKGROUND, SYSTEM_ALERT_WINDOW
  * the process's uid is ROOT_UID, SYSTEM_UID, NFC_UID, SHELL_UID.
  * the process's proc state is higher or equals to
PROCESS_STATE_BOUND_FOREGROUND_SERVICE.
  * the process's uid is DeviceOwner, or allowlisted by
DeviceIdleController.
3. The mAllowStartFgs ability can be passed to another process by
service binding. Except if the binder is PROCESS_STATE_PERSISTENT, this
ability does not pass down.

Bug: 171305836
Test: atest cts/tests/app/src/android/app/cts/ActivityManagerFgsBgStartTest.java#testFgsBindingFlagNone

Change-Id: I20d977ce7ae65316cdec2cd0ef9cf9bafec2adbd