[ARM] pxa: explicit #include <mach/dma.h> in various drivers

Where 'pxa_dma_desc' and 'pxa_{request,free}_dma' are referenced.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index c0fa9c9..64b3be1 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -20,8 +20,8 @@
 #include <linux/mtd/partitions.h>
 #include <linux/io.h>
 #include <linux/irq.h>
-#include <asm/dma.h>
 
+#include <mach/dma.h>
 #include <mach/pxa-regs.h>
 #include <mach/pxa3xx_nand.h>