[phantom] Omit an initialisation step now performed by the firmware

The firmware will now determine the right port mode on all cards, so
the PXE driver doesn't have to set it.  (Setting the port mode
apparently breaks some newer cards.)

src/drivers/net/phantom/phantom.c

 	phantom_writel ( phantom, 0, UNM_CAM_RAM_COLD_BOOT );
 
 	/* Set port modes */
-	phantom_writel ( phantom, UNM_CAM_RAM_PORT_MODE_AUTO_NEG,
-			 UNM_CAM_RAM_PORT_MODE );
 	phantom_writel ( phantom, UNM_CAM_RAM_PORT_MODE_AUTO_NEG_1G,
 			 UNM_CAM_RAM_WOL_PORT_MODE );