msm: board-qrd7627a: Add touchscreen device for 8625

Create a touchscreen platform device and pass controller's
config data and other related information as part of
platform data to atmel mxt driver.

Change-Id: Ib39e6f0f2e316bc371603f35ed5eb59f896bd7bb
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>