input: synaptics_fw_update: Parse the firmware_id only once

Firmware_id parsed two times. Remove the dead code and parse
the firmware_id only once.

This patch is propagated from msm-3.10 kernel
(commit: fb089f9978d42c5946fb33d07c5c10f5b9c51c14
input: synaptics_fw_update: Parse the firmware_id only once)

Change-Id: I10c373332aab328c8ed6c2583194141f4182ac06
Signed-off-by: Sarada Prasanna Garnayak <c_sgarna@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>