ARM: dts: msm: remove gpio output settings in dsi pinctrl

The generic pin control configuration for mdss should not
have gpio output settings. This change removes them so that
gpio output can be controlled in the driver.

Change-Id: I84c69571256ae5f1a11cdfe05d0ac90c49ec3d55
Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>