Move ENOTSUPP defines to include/linux/errno.h

Collect a couple of duplicated defines into a single place.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/include/linux/errno.h b/include/linux/errno.h
index 1a7a0b9..f3461b4 100644
--- a/include/linux/errno.h
+++ b/include/linux/errno.h
@@ -128,4 +128,6 @@
 #define	ENOMEDIUM	123	/* No medium found */
 #define	EMEDIUMTYPE	124	/* Wrong medium type */
 
+#define ENOTSUPP	524	/* Operation is not supported */
+
 #endif