treewide: Fix typo in printk and comments

Fix typo in printk and comments within various drivers.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 29387df4..ecbceaf 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -59,7 +59,7 @@
 {
 	if (type < ARRAY_SIZE(rproc_crash_names))
 		return rproc_crash_names[type];
-	return "unkown";
+	return "unknown";
 }
 
 /*