random: read wakeup threshold 512 -> 256

It's better to keep entropy pool available around 500~
s6e63m0: remove gamma level entry
s6e63m0: remove gamma level entry

Have forgot this
s6e63m0: allow maximum gamma level in manual mode

In auto mode,it will set 25(maximum) gamma level.
s6e63m0: add illumination tuner
defconfig: version tag 6.2 -> 6.3
s6e63m0: fix and add tweakable illumination table