ARM: dts: msm: Add firmware name of synaptics touch controller on 8226

Add firmware name of synaptics touch controller for the auto
firmware update.

CRs-Fixed: 578930
Change-Id: Ie236ad6a2675e3edd1299008b114d3da60ede9ec
Signed-off-by: Sarada Prasanna Garnayak <c_sgarna@codeaurora.org>
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>