RESTRICT AUTOMERGE: 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: cts-tradefed run cts -m CtsSecurityTestCases -t android.security.cts.ActivityManagerTest#testIsAppInForegroundNormal
Test: cts-tradefed run cts -m CtsSecurityTestCases -t android.security.cts.ActivityManagerTest#testIsAppInForegroundMalicious
Change-Id: I9602c89b2d40036e525c38960a08326dc74c6682