Bluetooth: Add SDK apis for Wipower and Peripheral feature

changes needed for Wipower and Periferal features.

CRs-fixed: 587811

Change-Id: Ibe73124daf78c79498fd1a6cbbcd75a88006c688
Bluetooth: Handle exceptions for bluetoot socket read

Handled IO exception in read function of BluetootSocket,
and also introduced a null check for mSocketIS.

CRs-Fixed: 605606
Change-Id: Ic948c72269e0de486a8f49163830528b002198ff
Bluetooth: Add Power apply enable event handling

Add Wipower Power apply enable related event handling
in frameworks

CRs-fixed: 612628

Change-Id: Iceb0cf8297ad0ab7080c0c494c1404127ff0258a
Merge branch 'kitkat' of https://github.com/LiquidSmooth/android_frameworks_base into kitkat