net: smc911x: includecheck fix for smc911x.h

fix the following 'make includecheck' warning:

  drivers/net/smc911x.h: mach/dma.h is included more than once.
Signed-off-by: NJaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/smc911x.h

@@ -236,7 +236,6 @@ static inline void SMC_outsl(struct smc911x_local *lp, int reg,
  * Use a DMA for RX and TX packets.
  */
 #include <linux/dma-mapping.h>
-#include <mach/dma.h>
 
 static dma_addr_t rx_dmabuf, tx_dmabuf;
 static int rx_dmalen, tx_dmalen;