Revert "drm/mediatek: Clear pending flag when cmdq packet is done"

Revert "drm/mediatek: Clear pending flag when cmdq packet is done"

This reverts commit 18ff9e11555a57adca3b76514a8dbc8033cc717d.

Commit 6736494a850a
("drm/mediatek: Use mailbox rx_callback instead of cmdq_task_cb")
would cause numerous mtk cmdq mailbox driver warning:

WARNING: CPU: 0 PID: 0 at drivers/mailbox/mtk-cmdq-mailbox.c:198
cmdq_task_exec_done+0xb8/0xe0

So revert that patch and all the patches depend on that patch.

Reported-by: Enric Balletbo Serra <eballetbo@gmail.com>
Tested-by: Enric Balletbo Serra <eballetbo@gmail.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>