msm: mdss: fix to update the configuration for display related GPIOs

After commit dbe80b7c ("ARM: dts: msm:
remove gpio output settings in dsi pinctrl") driver is no longer
defining in the pinctrl the gpios as output high configuration;
so driver now has to explicitly configure gpio output direction.
This change add the settings in the driver to configure the gpio
as output pin, fixing panel issues when booting-up with
continuous splash disabled.

Change-Id: I1ac3c5dd07cff4a30cce9de3c340f071dd84d49a
Signed-off-by: Ingrid Gallardo <ingridg@codeaurora.org>