msm: mdss: Reset panel to apply RGB gamma data

Writing to the reset gpios produces a short flicker. This however
appears to be the only reliable method to apply RGB gamma data
without switching the panel off and on again.

Signed-off-by: Dan Trifan <jimsth@gmail.com>
Revert "msm: mdss: Remove distinction between positive and negative polarities"

This reverts commit db44a1545c3b47fb111685b3a5ec97d93a23df6f.

Signed-off-by: Dan Trifan <jimsth@gmail.com>