[ARM] Fix second missing declaration of cache_is_vivt()

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

arch/arm/kernel/ecard.c

@@ -41,7 +41,6 @@
 #include <linux/device.h>
 #include <linux/init.h>
 
-#include <asm/cacheflush.h>
 #include <asm/dma.h>
 #include <asm/ecard.h>
 #include <asm/hardware.h>

include/asm-arm/mmu_context.h

@@ -13,6 +13,7 @@
 #ifndef __ASM_ARM_MMU_CONTEXT_H
 #define __ASM_ARM_MMU_CONTEXT_H
 
+#include <asm/cacheflush.h>
 #include <asm/proc-fns.h>
 
 #if __LINUX_ARM_ARCH__ >= 6