ARM: dts: msm: add synaptics touch firmware for wearables

Add synaptics touch firmware name as DT property for SDW3100
and SDW2500 wearable devices, so that touch driver can prase
and flash it while boot-up.

Change-Id: Ic5ac49f034c4d72cb6598efd2e6bef1633fd604e
Signed-off-by: Shantanu Jain <shjain@codeaurora.org>