TSP: Add support for setting vibration intensity

Based on:
https://github.com/pengus77/lge-kernel-star/commit/2e7eb842a562735802392532691c3b0497fba536
https://github.com/CyanogenMod/android_kernel_samsung_jf/commit/2515381417287a7031ed3ac4f1778bd5d5486571

Change-Id: I40da679027c90998c8b8310475431e4d90292747