input: touchscreen: bumb touchboost to current git

Updated to a more simple one, all credit belongs to
@franciscofranco : https://github.com/franciscofranco/hammerhead/blob/da73f02f601f394b742bf1cdbecd9f9e258efc90/drivers/input/touchscreen/touchboost.c

The only thing i changed was fixing a compiler warning.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
hotplug: lock cpus during hotplugging

In theory, a cpu could go offline while we iterate through
all online cpus. In reality, this probably won't happen
since we calculate before we actually start the hotplugging.

Better save than sorry.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>