msm: mdss: Fix handling of DSI panel enable gpio

Panel enable GPIO is optional for some panels. DSI driver
should not operate on this GPIO if it is not configured
in the device file of the panel.

Change-Id: Ic1c8510758e12276eeeb94af808cdc0afa4686aa
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
2 files changed