arm/dt: msm8610: Add support for Atmel touchscreen

Add necessary GPIO, clock and DT settings for Atmel touch
controller to work on CDP & MTP.  This includes settings for
i2c, and disabling the spi bus which was configured on
the same address.

Change-Id: Ic1e8322603bf454d5772ef4fecbc57765c9c0dd9
Signed-off-by: Chun Zhang <chunz@codeaurora.org>