Set explicit package name on Intent for showing TV PiP

We broadcast an intent when opening the TV PiP menu, which is received
by SystemUI. This causes a warning since sending non-protected
broadcasts is dangerous. Setting the package name explicitly lets
ActivityManagerService determine that the broadcast is safe since
it is only sent within SystemUI.

Bug: 222250868
Fix: 222250868
Test: Open PiP, `adb shell input keyevent WINDOW`, observe logcat
Change-Id: I833752a52774ca933724f64a02edc45c898b080b