MAX_DMA_CHANNELS is defined in asm/scatterlist.h of the powerpc
architecture.  Rename this #define in xgbe.h to avoid the
redefined warning issued during compilation.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
        DBGPR("--> xgbe_probe\n");
 
        netdev = alloc_etherdev_mq(sizeof(struct xgbe_prv_data),
-                                  MAX_DMA_CHANNELS);
+                                  XGBE_MAX_DMA_CHANNELS);
        if (!netdev) {
                dev_err(dev, "alloc_etherdev failed\n");
                ret = -ENOMEM;
 
 #define RX_MIN_BUF_SIZE                (ETH_FRAME_LEN + ETH_FCS_LEN + VLAN_HLEN)
 #define RX_BUF_ALIGN           64
 
-#define MAX_DMA_CHANNELS       16
+#define XGBE_MAX_DMA_CHANNELS  16
 #define DMA_ARDOMAIN_SETTING   0x2
 #define DMA_ARCACHE_SETTING    0xb
 #define DMA_AWDOMAIN_SETTING   0x2