Settings: add USB OTG & UICC features' UI support.

 - Modified string resources for appropriate alerts based on volume type

 - Changed title/summary strings for preferences based on volume type

 - There are two mountable partitions coming with UICC. But
   only one volume supports UMS. Only that should be shown in
   Settings->Storage screen.

 - UICC storage and OTG storage is shown, Hide not supported hardware UI.

 - Showing mount options for UICC, based on a system property
   Within Storage Settings, 'UICC Storage' category is shown based
   on a system property - persist.sys.isUICCEnabled
   It shall be not set by default, so UI will hide the 'UICC'
   mount/unmount menus.

 - Add UMS mode support, Android only supports MTP and PTP mode in
   UsbSettings screen, this change is to add USB mass storage mode.

Change-Id: I02f111e98517052ed13de0b81b463bc455392edb