arch/score/mm/cache.c: Export 'flush_icache_range'

The related error (with allmodconfig under score):

MODPOST 1365 modules
ERROR: "flush_icache_range" [drivers/misc/lkdtm.ko] undefined!

---
 arch/score/mm/cache.c | 1 +
 1 file changed, 1 insertion(+)

index be91041..b4bcfd3 100644
@@ -278,3 +278,4 @@ void flush_icache_range(unsigned long start, unsigned long end)
 		start += L1_CACHE_BYTES;
 	}
 }
+EXPORT_SYMBOL(flush_icache_range);

1.9.2.459.g68773ac