sweep2dim: reduce/raise kcal via sweep2sleep gestures

User configurable left->right swipe (brighten) power
sysfs paths:
/sys/module/sweep2wake/parameters/s2d_enabled
/sys/module/sweep2wake/parameters/up_kcal
/sys/module/sweep2wake/parameters/down_kcal

User must disable s2w/s2s while using. Great for insta-privacy if you set the up/down_kcal to 255 or higher :D
Disable sweep2wake:
echo "0" /sys/android_touch/sweep2wake

Conflicts:
	drivers/video/msm/mdss/mdss_mdp_pp.c