Updated isAppForeground implementation.

With isAppForeground being  moved to ActivityManagerInternal,
this change updates the implementation in the Facade call.

Bug: 119327603
Test: atest WifiServiceImplTest
Test: atest WifiLockManagerTest
Change-Id: Ic23980dae69a028658230c0d7e1e03adecaf5214
1 file changed