msm: mdss: always request for dsi gpios when cont splash is enabled

When continuous splash screen feature is enabled, the panel is left
turned on by the bootloader. In such cases, we need to request all
the GPIOs used by the DSI driver at probe time. In the current
implementation, the GPIOs are not requested if certain panel specific
flags are set. This results in a bug when an attempt is made to free
these GPIOs when the device is suspended. Fix this by ensuring that
the GPIOs are requested unconditionally.

Change-Id: If0bea80aab819aeafdaaedf81451d5fa64d4e76d
CRs-Fixed: 684253
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>