input: synaptics_dsx_fw_update: update fw based on config id

Update the firmware based on strict config ID versioning, rather than
the entire config ID as a 4 byte number. This will also protect
against config ID major number mismatches and packrat id mismatches.

This is a propagated patch from 3.10 kernel.
commit - 458cbab5c53d5141a66590441f9567d67d580c6f,
input: synaptics_dsx_fw_update: update fw based on config id

Change-Id: I1097585d3bd8b6ab753676dc56f268c7ce52680d
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>