[DO NOT MERGE] Add toggle for media resumption

Adds a toggle under Settings > Sound > Media to toggle media resumption

Bug: 154039093
Test: manual
Test: atest SettingsProviderTest
Test: make -j40 RunSettingsRoboTests ROBOTEST_FILTER="MediaControls"

Change-Id: I803c57031bc3252cab35c06ea124d1c22a3c3aeb

src/com/android/settings/Settings.java

@@ -235,4 +235,9 @@ public class Settings extends SettingsActivity {
     public static class AccountDashboardActivity extends SettingsActivity {}
     public static class SystemDashboardActivity extends SettingsActivity {}
 
+    /**
+     * Activity for MediaControlsSettings
+     */
+    public static class MediaControlsSettingsActivity extends SettingsActivity {}
+
 }