input: synaptics: update license and driver version

 - Change license to GPL v2
 - Driver version 1.2

This patch is a propagated patch from 3.4 kernel
commit - bd1dac25b5342758c20832224116158ab475e09e,
input: synaptics: update license and driver version

Change-Id: I4603c0bfd1c452fa4bf4ea1ee0929745a24a4cc2
[amaloche@codeaurora.org: Added subject line]
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>
Signed-off-by: Abinaya P <abinayap@codeaurora.org>