Merge the UHID driver, backported from Linux 3.8.

The userspace HID driver is needed by the KK Bluetooth stack in order to
process input from Bluetooth keyboards.

Credit: This is almost an identical copy of the @plaguedbypenguins work
for @KonstaT fork of zte-kernel-msm7x27. Changes copied from
@kerberizer's fork
Ref:
https://github.com/kerberizer/android_kernel_sony_msm8x60/commit/2acf0de488ed052af54a9652d891e19e6771966f