soc: ti: wkup_m3_ipc: Remove unneeded semicolon

Eliminate the following coccicheck warning:
./drivers/soc/ti/wkup_m3_ipc.c:691:2-3: Unneeded semicolon

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20220504225125.45830-1-yang.lee@linux.alibaba.com