drm/bridge: ti-sn65dsi83: Allow GPIO operations to sleep

There is no need to require non-sleeping GPIO access. Silence the
WARN_ON() if GPIO is using e.g. I2C expanders.

Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220614095835.1398708-2-alexander.stein@ew.tq-group.com


Reviewed-by: Robert Foss <robert.foss@linaro.org>