[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/net/smc911x.h b/drivers/net/smc911x.h
index cc7d85b..870b4c3 100644
--- a/drivers/net/smc911x.h
+++ b/drivers/net/smc911x.h
@@ -200,6 +200,9 @@
 
 
 #ifdef SMC_USE_PXA_DMA
+
+#include <mach/dma.h>
+
 /*
  * Define the request and free functions
  * These are unfortunately architecture specific as no generic allocation