drm/panel: ronbo-rb070d30: fix warning with gpio controllers that sleep

drm/panel: ronbo-rb070d30: fix warning with gpio controllers that sleep

The ronbo-rb070d30 controles the various gpios for reset, standby,
vertical and horizontal flip using the non-sleeping gpiod_set_value()
function.

Switch to using gpiod_set_value_cansleep() when controlling reset_gpio to
support GPIO providers that may sleep, such as I2C GPIO expanders.

This fixes noisy complaints in kernel log for gpio providers that do
sleep.

Signed-off-by: Josua Mayer <josua@solid-run.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251117-imx8mp-hb-iiot-v3-5-bf1a4cf5fa8e@solid-run.com