spi: spi-pxa2xx: only include mach/dma.h for legacy DMA

Move the include of mach/dma.h to the legacy PXA DMA code where it is used.
This enables building spi-pxa2xx on ARM64.

Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi-pxa2xx-pxadma.c b/drivers/spi/spi-pxa2xx-pxadma.c
index 6c82d49..3fecaaa 100644
--- a/drivers/spi/spi-pxa2xx-pxadma.c
+++ b/drivers/spi/spi-pxa2xx-pxadma.c
@@ -25,6 +25,7 @@
 #include <linux/spi/spi.h>
 #include <linux/spi/pxa2xx_spi.h>
 
+#include <mach/dma.h>
 #include "spi-pxa2xx.h"
 
 #define DMA_INT_MASK		(DCSR_ENDINTR | DCSR_STARTINTR | DCSR_BUSERR)