[PATCH] arm: fix dependencies for MTD_XIP

MTD_XIP depends on having working asm/mtd-xip.h; it's not just per-architecture
(arm-only, as current Kconfig would have it), but actually per-subarch as
well.  Introduced a new symbol (ARCH_MTD_XIP) set by arch Kconfig; MTD_XIP
depends on it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/mtd/chips/Kconfig b/drivers/mtd/chips/Kconfig
index effa0d7..205bb70 100644
--- a/drivers/mtd/chips/Kconfig
+++ b/drivers/mtd/chips/Kconfig
@@ -301,7 +301,7 @@
 
 config MTD_XIP
 	bool "XIP aware MTD support"
-	depends on !SMP && (MTD_CFI_INTELEXT || MTD_CFI_AMDSTD) && EXPERIMENTAL && ARM
+	depends on !SMP && (MTD_CFI_INTELEXT || MTD_CFI_AMDSTD) && EXPERIMENTAL && ARCH_MTD_XIP
 	default y if XIP_KERNEL
 	help
 	  This allows MTD support to work with flash memory which is also