drm/bridge: lt9611: fix programming of video modes

drm/bridge: lt9611: fix programming of video modes

[ Upstream commit b3e77c50fa21aba7c8edef51e415f1a6c87312f6 ]

Program the upper part of the hfront_porch into the proper register.

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/20230118081658.2198520-5-dmitry.baryshkov@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>