bus: imx-weim: make symbol 'weim_of_notifier' static

The sparse tool complains as follows:

drivers/bus/imx-weim.c:373:23: warning:
symbol 'weim_of_notifier' was not declared. Should it be static?

This symbol is not used outside of imx-weim.c, so marks it static.

Fixes: e6cb5408289f ("bus: imx-weim: add DT overlay support for WEIM bus")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: Shawn Guo <[e-mail]>

drivers/bus/imx-weim.c

···
 	return ret;
 }
 
-struct notifier_block weim_of_notifier = {
+static struct notifier_block weim_of_notifier = {
 	.notifier_call = of_weim_notify,
 };
 #endif /* IS_ENABLED(CONFIG_OF_DYNAMIC) */