mdss_dsi_panel.c: add powersuspend hooks

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
LCD KCAL: Fix Gamma max value issue

Major thanks to Yorici Vz for his tireless pursuit of perfection on Nexus 5
Color / Gamma :D

Signed-off-by: Paul Reioux <reioux@gmail.com>
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>