Initial import: sweep2wake
s2w: Register power key input device

-sweep2wake resumes from sleep my simulating a power key press.
It needs the power key input device to do this.
s2w: adjust tuneables
s2w: ft5x06_ts - plug in the touchscreen.
-hooking the sweep detection method for sweep2wake and clear some
vars for it at appropriate times.
s2w: add to sero defconfig
s2w: add sysfs interface for enable/disable.
-See notes in code.
s2w: add wake lock.

-sweep2wake does not seem to work in deep sleep so I had to implement
a wakelock.
s2w: add wakelock to sero defconfig