max11871: fix calibration for x and y coordinates

max11871: fix calibration for x and y coordinates

BZ: 25967

x/y co-ordinates are marginally off

Change-Id: If4a9818088fd4186129e1060c0690408974299b3
Signed-off-by: Prabu Renganathan <prabu.renganathan@intel.com>
Reviewed-on: http://android.intel.com:8080/37307
Reviewed-by: Liu, Hong <hong.liu@intel.com>
Reviewed-by: Du, Alek <alek.du@intel.com>
Tested-by: Wang, Zhifeng <zhifeng.wang@intel.com>
Reviewed-by: Monroy, German <german.monroy@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>