config_deviceHardwareKeys: the correct default is 0

How about instead of having to set 438 device trees to have the correct value
in each device tree overlay we make the 10 devices that still use hardware keys
set the correct value in their device tree overlays.. KTHNX.

Change-Id: Ibef20d7dc6e2fd718dbf2349a01682dac81ebf4f
Merge "config_deviceHardwareKeys: the correct default is 0" into L5