[ARM] Fix typo in tlbflush.h

s/CONFIG_MMY/CONFIG_MMU/

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/tlbflush.h

@@ -16,7 +16,7 @@
 
 #define tlb_flush(tlb)	((void) tlb)
 
-#else /* CONFIG_MMY */
+#else /* CONFIG_MMU */
 
 #include <asm/glue.h>