drm/bridge: sii902x: Allow reset line to be tied to a sleepy GPIO controller

Switch to gpiod_set_value_cansleep() in sii902x_reset().
This is relevant if the reset line is tied to a I2C GPIO
controller.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221228145704.939801-1-w.egorov@phytec.de