touchscreen: added double tap to wake - WIP

Conflicts:
	drivers/input/touchscreen/synaptics_3200.c
touchscreen: double tap to wake - added y-barrier
touchscreen: double tap to wake must be handled before s2w
touchscree: double tap to wake: added sysfs for s2w_double_tap_barrier_y
touchscreen: double tap to wake: set default threshold to 500ms
touchscreen: double tap to wake: change threshold to be a delta value
touchscreen: double tap to wake: make me famous :)
touchscreen: double tap to wake: remove unneeded conversion to ns
tegra: revert all clock tweaks to stock
#303

Signed-off-by: Xmister <xmisterhu@gmail.com>