treewide: Fix typo in various drivers

Correct spelling typo in printk within various drivers.

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index dde8b50..6b39e48 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1449,7 +1449,7 @@
 	case I915_BIT_6_SWIZZLE_9_10_17:
 		return "bit9/bit10/bit17";
 	case I915_BIT_6_SWIZZLE_UNKNOWN:
-		return "unkown";
+		return "unknown";
 	}
 
 	return "bug";