immvibespi: add sysfs interface for controlling vibe intensity

This is based of codeworkx's work on smdk4412

Useful with something like this:
http://review.cyanogenmod.org/#/c/35981/

Change-Id: I1c1c16b4cefd600ebc6caa603d92044c466cf792
Revert "vibration interface: modify show value"

This reverts commit ba390c37fd23e978f980c9c359c6500a543e7b6e.
Revert "Added vibration interface"

This reverts commit bcfb2d036cc6e8bb4dedab644e3bab0a75232bb0.

Conflicts:

	drivers/motor/tspdrv.c
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_kernel_samsung_d2 into jb-mr1