Correctly advertise that the N7 has no hardware keys.

Change-Id: I7af7e38b538a038e837be9a8496a85151c7afc24
Revert "Turn off BLE, GATT, and SMP of Bluetooth stack"

This reverts commit 67b7e3ac6f697f37b709a403dbe82d7ec6a83e55.

Enable BLE, GATT and SMP for Nexus 7 2012 grouper and tilapia

Change-Id: I640b3b76a341efc98d1ed69b1dc60425cdc0070b