Move shouldUseLauncherIcon to CarNotificationBodyView

This is to address the comments in ag/18875047, that is to move
shouldUseLauncherIcon method to CarNotificationBodyView.
Also moved loadAppLauncherIcon to the same class since the two
method use the same parameter.

Bug: 233552657
Test: Manual
Change-Id: I9db1db46089d0888efff27b80a45d7d5ccddfbc4
12 files changed