mipi_samsung_oled: Set gammas without need for a screen reset

Split from df3f71a & dc5e59e of https://github.com/DecimalMan/dkp

[ljc: Rework with shipped APIs]
Signed-off-by: Luis Cruz <ljc2491@gmail.com>

Change-Id: I021f810d4c413ebff6660ae0dda70b31ea97be00
oled: d2, etc: Clean up some logspam

when utilizing userspace controls

Change-Id: I1589728d6012afafca53fb549cc032157d126af6
Signed-off-by: Luis Cruz <ljc2491@gmail.com>