Revert "Turn off BLE, GATT, and SMP of Bluetooth stack"

This reverts commit b40835e5ba7c62565499a87ee0e2b8663e2fb1b2.

Enable Bluetooth Low Energy for Galaxy Nexus as the hardware has support for it

Change-Id: I4e267b53d6ceb932d8cad80f82b11992be0540e2