drivers/net/: Use the DMA_{64,32}BIT_MASK constants

Use the DMA_{64,32}BIT_MASK constants from dma-mapping.h when calling
pci_set_dma_mask() or pci_set_consistent_dma_mask()

This patch includes dma-mapping.h explicitly because it caused errors
on some architectures otherwise.

See http://marc.theaimsgroup.com/?t=108001993000001&r=1&w=2 for details

Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Domen Puncer <domen@coderock.org>
diff --git a/drivers/net/ns83820.c b/drivers/net/ns83820.c
index c336b46..cc796527 100644
--- a/drivers/net/ns83820.c
+++ b/drivers/net/ns83820.c
@@ -101,6 +101,7 @@
 #include <linux/moduleparam.h>
 #include <linux/types.h>
 #include <linux/pci.h>
+#include <linux/dma-mapping.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/delay.h>