MLK-14665 video: fbdev: mxc: mipi dsi: Customize gpio reset function

MLK-14665 video: fbdev: mxc: mipi dsi: Customize gpio reset function

The mxc display driver framework doesn't support deferral probe.
The following initialization process may cause the mipi dsi driver
deferral probe, however.
pinctrl-imx6 - arch_initcall
gpio-mxc - subsys_initcall
gpio-reset - arch_initcall

This patch customizes gpio reset function so that we can remove
the code to use the reset logic provided by the gpio-reset driver.
Also, the gpio-reset driver is not in the upstreaming kernel,
so it would be good not to use it if possible.

Signed-off-by: Liu Ying <victor.liu@nxp.com>