bus: mvebu-mbus: make mvebu_mbus_syscore_ops static

Make mvebu_mbus_syscore_ops static as it does not get
used or declared outside mvebu-mbus.c to fix the following
sparse warning:

linux/drivers/bus/mvebu-mbus.c:1092:20: warning: symbol 'mvebu_mbus_syscore_ops' was not declared. Should it be static?

Signed-off-by: Ben Dooks <[e-mail]>
Acked-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

drivers/bus/mvebu-mbus.c

···
 	}
 }
 
-struct syscore_ops mvebu_mbus_syscore_ops = {
+static struct syscore_ops mvebu_mbus_syscore_ops = {
 	.suspend	= mvebu_mbus_suspend,
 	.resume		= mvebu_mbus_resume,
 };