drm/bridge: lt9611: fix polarity programming

drm/bridge: lt9611: fix polarity programming

[ Upstream commit 9d6163ebe4c22613875245e1ba9cc4880fc62cdb ]

Fix programming of hsync and vsync polarities

Fixes: 4e9e2250396c ("drm/bridge: Introduce LT9611 DSI to HDMI bridge")
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230118081658.2198520-4-dmitry.baryshkov@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>