mailbox: pcc: fix platform_no_drv_owner.cocci warnings

./drivers/mailbox/pcc.c:580:3-8: No need to set .owner here. The core
will do it.

Remove .owner field if calls are used which set it automatically

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>