Added an app id security check in isAppForeground.

ActivityManagerService#isAppForeground now checks if the caller has the
permission to view if an app is in the foreground.

Bug: 115384617
Test: atest cts/tests/tests/security/src/android/security/cts/ActivityManagerTest.java#testActivityManager_checkAppInForegroundCall
Change-Id: I9602c89b2d40036e525c38960a08326dc74c6682