MIPS: Netlogic: Fix DMA zone selection for 64-bit

Fix Kconfig for both XLR and XLP to select ZONE_DMA32 (instead of ZONE_DMA)
in case of 64-bit compilation. This can be used for devices that can only
do DMA to 32-bit address. ZONE_DMA is not useful on XLR or XLP.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4466
Signed-off-by: John Crispin <blogic@openwrt.org>

arch/mips/Kconfig

@@ -817,7 +817,7 @@ config NLM_XLR_BOARD
 	select CSRC_R4K
 	select IRQ_CPU
 	select ARCH_SUPPORTS_MSI
-	select ZONE_DMA if 64BIT
+	select ZONE_DMA32 if 64BIT
 	select SYNC_R4K
 	select SYS_HAS_EARLY_PRINTK
 	select USB_ARCH_HAS_OHCI if USB_SUPPORT
@@ -845,7 +845,7 @@ config NLM_XLP_BOARD
 	select CEVT_R4K
 	select CSRC_R4K
 	select IRQ_CPU
-	select ZONE_DMA if 64BIT
+	select ZONE_DMA32 if 64BIT
 	select SYNC_R4K
 	select SYS_HAS_EARLY_PRINTK
 	select USE_OF