Revert "mako LCD: keep RGB custom colors alive after screen off/on"

This reverts commit 4501fcdbc13c1aba605d2b1981badd7e829b763b.
mako LCD: keep RGB custom colors alive after screen off/on

When the back-light turns back on, reset the RGB values set in
sysfs (/sys/devices/platform/kcal_ctrl.0/kcal)