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: Ie121d1f21a71a702c4c7af49fa363c68a757b000
grouper: Remove config_deviceHardwareKeys

Not supported anymore/currently.

Change-Id: I696b6d05b28fdc1ca9c207957bc6a6c18647f576

Conflicts:
	overlay/frameworks/base/core/res/res/values/config.xml