Revert "drm/mediatek: dsi: Correct calculation formula of PHY Timing"

This reverts commit 417d8c47.

With that patch the panel in the Tentacruel ASUS Chromebook CM14
(CM1402F) flickers. There are 1 or 2 times per second a black panel.
Stable Kernel 6.11.5 and mainline 6.12-rc4 works only when reverse
that patch.

Fixes: 417d8c47 ("drm/mediatek: dsi: Correct calculation formula of PHY Timing")
Cc: stable@vger.kernel.org
Cc: Shuijing Li <shuijing.li@mediatek.com>
Reported-by: Jens Ziller <zillerbaer@gmx.de>
Closes: https://patchwork.kernel.org/project/dri-devel/patch/20240412031208.30688-1-shuijing.li@mediatek.com/
Link: https://patchwork.kernel.org/project/dri-devel/patch/20241212001908.6056-1-chunkuang.hu@kernel.org/


Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>