ARM: mach-msm: Configure touch screen i2c mode for 8974 liquid

I2C mode is only available on 8974 liquid with Atmel 1664S touch
controller. This support introduces a software based pull-up
for touch controller I2C bus.

Change-Id: Id3a66643577838fc506050bcbb271d1df282c16e
Signed-off-by: Chun Zhang <chunz@codeaurora.org>