Cleanup Storage Settings

There is AOSP built in file browser for image/video/audio
file category, this change cleanup APP based category
for image/video/audio.

Bug: 183078080
Test: atest com.android.settings.deviceinfo
      atest com.android.settings.deviceinfo.storage
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.deviceinfo
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.deviceinfo.storage
Change-Id: I925fc9296b8c2df5bd793668f66a12beb7744469