Hide system update settings.
settings: port ime selector notification toggle

framework changes already present

Change-Id: Iffd7cf5c3eb7368974e792194e9ebe8a75ca35b7
Settings: Forward port Volume button music controls

FW side already exists.

Original author: Danesh Mondegarian (devatwork)

Change-Id: I174fa5ec72e36e29d7c8d139213905f3327f6aae
Settings: fix storage measurement for device without emulated sdcard

StorageMeasurement: misc files should only be measured for internal
storage only if it is the emulated storage, otherwise misc count
for the primary storage will be erroneously duplicated on the
internal storage count.

StorageVolumePreferenceCategory:
  - Always create mMountTogglePreference to avoid null pointer
    exception for code that relies on it existing
  - Check if the keys exist before calculating totalValues to
    avoid null pointer exception on storage where media is not
    calculated
  - For available/readonly, set title, not summary (summary is
    supposed to be the amount available)

Change-Id: Ib217f79ee562dffc514696fff038e58ed0dba7d9