drm/mediatek: dsi: Add dsi per-frame lp code for mt8188

Adding the per-frame lp function of mt8188, which can keep HFP in HS and
reduce the time required for each line to enter and exit low power.
Per Frame LP:
  |<----------One Active Frame-------->|
--______________________________________----___________________
  ^HSA+HBP^^RGB^^HFP^^HSA+HBP^^RGB^^HFP^    ^HSA+HBP^^RGB^^HFP^

Per Line LP:
  |<---------------One Active Frame----------->|
--______________--______________--______________----______________
  ^HSA+HBP^^RGB^  ^HSA+HBP^^RGB^  ^HSA+HBP^^RGB^    ^HSA+HBP^^RGB^

Signed-off-by: Shuijing Li <shuijing.li@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20240826060654.24038-1-shuijing.li@mediatek.com/


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