Make the Output Switcher layout up to the spec.

This change is required for both current and the refreshed dialog UI.

1. Use constraint layout to restrict the RecyclerView max height
 instead of Java calculations which were incorrect.
2. Align album art to the left edge, remove programmatic addition
of padding.
3. Add bottom padding to the application logo to match the
spec.

Flag: EXEMPT bugfix
Bug: 400990665
Fix: 400990665
Test: atest
SystemUIGoogleScreenshotTests:com.android.systemui.media.dialog,
atest SystemUITests:com.android.systemui.media.dialog
Change-Id: I8da11afc3b04dc6b0b7ebef58e58ee024b7b15a5