mailbox: mtk-cmdq: remove cl in struct cmdq_pkt

Every client driver has the struct cmdq_client information, so
it's not necessary to store it in struct cmdq_pkt. cl is used to
store struct cmdq_client information and now no client driver use
it, so remove it.

Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Author: Chun-Kuang Hu

include/linux/mailbox/mtk-cmdq-mailbox.h

@@ -75,7 +75,6 @@ struct cmdq_pkt {
 	dma_addr_t		pa_base;
 	size_t			cmd_buf_size; /* command occupied size */
 	size_t			buf_size; /* real buffer size */
-	void			*cl;
 };
 
 u8 cmdq_get_shift_pa(struct mbox_chan *chan);