panel: add IR compensation into the hbm mode attribute
Added a IR compensation(IRC) control capability into
the hbm mode attribute. "0" stands for hbm off,
"1" stands for hbm on and irc on, "2" stands for hbm on
and irc off.
Bug: 177144573
test: "echo 2 > sys/class/backlight/panel0-backlight/hbm_mode"
Signed-off-by:
linpeter <linpeter@google.com>
Change-Id: I0a0f382e6904917e21afa826d18d7502bc403544
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