MIPS: Kconfig: Move ZONE_DMA to a more appropriate place.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 87ddac9..f17ba1e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -46,9 +46,6 @@
 
 menu "Machine selection"
 
-config ZONE_DMA
-	bool
-
 choice
 	prompt "System type"
 	default SGI_IP22
@@ -2464,6 +2461,9 @@
 	select CLKEVT_I8253
 	select MIPS_EXTERNAL_TIMER
 
+config ZONE_DMA
+	bool
+
 config ZONE_DMA32
 	bool