input: ft5x06_ts: Upgrade firmware based on version

Upgrade firmware on the controller only when a new
version of firmware is available.

This patch is propagated from msm-3.18 kernel
'commit 88d102ef081f ("input: ft5x06_ts: Upgrade
firmware based on version")'

Change-Id: I4cf75b3c5efb90f151da09ed73b1ba62b9b5bb1c
Signed-off-by: Mohan Pallaka <mpallaka@codeaurora.org>