ARM: dts: apq: Enable touch controller on 8084 Liquid

8084 Liquid is using Atmel touch controller. Corresponding device
tree information is needed to properly enable touch function.

Change-Id: Ie69effac6e40e4074fa83ffcfee2b7e5b63d9507
Signed-off-by: Chun Zhang <chunz@codeaurora.org>