input: synaptics: add ability to distinguish touch part

The touchscreen controllers are field-swappable on both
customer devices and internal reference devices. For
Synaptics touch controller, package ID is a unique
identifier that is used to uniquely distinguish the touch
controller part. However, it is still possible to flash
these touch controllers with different firmware images. In
such a case, same touch controller's sensor will have
different dimensions depending on the firmware image
flashed in it. The patch adds the ability to identify
the correct sensor dimension for above use case. If
package ID read from device tree matches the package ID
read from touch controller, the driver also checks if
the sensor dimensions read from device tree match those
which are read from the touch controller.

This patch is propagated from msm-3.10 kernel
(commit: 08478ca90baf7a48cdd549d4df1fdc4284b568ed
input: synaptics: add ability to distinguish touch part)

Change-Id: I8423df30c61aaa7696c494aa5f105f169ad9c954
Signed-off-by: Himanshu Aggarwal <haggarwa@codeaurora.org>
Signed-off-by: Sarada Prasanna Garnayak <c_sgarna@codeaurora.org>
Signed-off-by: Sudhakar Manapati <smanap@codeaurora.org>