drm/panel: boe-th101mb31ig002 : Fix the way to get porch parameters

drm/panel: boe-th101mb31ig002 : Fix the way to get porch parameters

The current driver can only obtain the porch parameters
of boe-th101mb31ig002. Modify it to obtain the porch
parameters of the panel currently being used.

Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Zhaoxiong Lv <lvzhaoxiong@huaqin.corp-partner.google.com>
Link: https://lore.kernel.org/r/20240723062615.14796-2-lvzhaoxiong@huaqin.corp-partner.google.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240723062615.14796-2-lvzhaoxiong@huaqin.corp-partner.google.com