mailbox: bcm74110: remove unneeded semicolon

No functional modification involved.

./drivers/mailbox/bcm74110-mailbox.c:483:2-3: Unneeded semicolon.
./drivers/mailbox/bcm74110-mailbox.c:563:2-3: Unneeded semicolon.

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=22936


Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>