[ARM] dmabounce requires ZONE_DMA

Rather than having everything that needs DMABOUNCE also select
ZONE_DMA, arrange for DMABOUNCE to select it instead.  This is
far more sensible.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4853f9d..6c73e96 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -354,7 +354,7 @@
 	select GENERIC_GPIO
 	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
-	select ZONE_DMA if PCI
+	select DMABOUNCE if PCI
 	help
 	  Support for Intel's IXP4XX (XScale) family of processors.