[MTD] 4xx: Don't build arch/ppc dependent drivers in arch/powerpc

These drivers are specific to 4xx support in arch/ppc at the moment.  Make
sure they don't get built on arch/powerpc.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index cc6c734..3a6566a 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -354,7 +354,7 @@
 
 config MTD_WALNUT
 	tristate "Flash device mapped on IBM 405GP Walnut"
-	depends on MTD_JEDECPROBE && WALNUT
+	depends on MTD_JEDECPROBE && WALNUT && !PPC_MERGE
 	help
 	  This enables access routines for the flash chips on the IBM 405GP
 	  Walnut board. If you have one of these boards and would like to
@@ -370,7 +370,7 @@
 
 config MTD_OCOTEA
 	tristate "Flash devices mapped on IBM 440GX Ocotea"
-	depends on MTD_CFI && OCOTEA
+	depends on MTD_CFI && OCOTEA && !PPC_MERGE
 	help
 	  This enables access routines for the flash chips on the IBM 440GX
 	  Ocotea board. If you have one of these boards and would like to
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index f1d60b6..a783d62 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -134,7 +134,7 @@
 
 config MTD_NAND_NDFC
 	tristate "NDFC NanD Flash Controller"
-	depends on 44x
+	depends on 44x && !PPC_MERGE
 	select MTD_NAND_ECC_SMC
 	help
 	 NDFC Nand Flash Controllers are integrated in EP44x SoCs