ARM: dts: msm: correct I2C slave address of touch controller

8916 QRD use a Synaptics S3207A touch controller with I2C slave
address of 0x70. Correct the slave address in dtsi node of touch
panel.

Change-Id: I8c7b4576e500e550a258ef06f3ac21f2261ebebc
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>