linux/compat.h: Define empty __initconst and __initdata

Introduce two new empty macros used in various static tables in Linux.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 921e698..f8e3570 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -271,6 +271,8 @@
 #define __devinit
 #define __devinitdata
 #define __devinitconst
+#define __initconst
+#define __initdata
 
 #define kthread_create(...)	__builtin_return_address(0)
 #define kthread_stop(...)	do { } while (0)