Use PendingIntent for media click action over lockscreen

The clickIntent is provided by apps as the notification's contentIntent,
and it should be sent as is. This fixes the case where the intent called
an activity that could show over lockscreen.

Bug: 271845008
Test: atest MediaControlPanelTest
Test: manually with test app
Change-Id: I09d64452c46c4d21b9d958570020b2f5e6c2b23f
2 files changed