am335x_evm: enable usb ether gadget as it supports DM_ETH

Since usb ether gadget have support for driver model, so enable
usb ether gadget.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/am335x_evm.h

@@ -281,12 +281,9 @@
 #endif
 
 #ifdef CONFIG_USB_MUSB_GADGET
-/* Removing USB gadget and can be enabled adter adding support usb DM */
-#ifndef CONFIG_DM_ETH
 #define CONFIG_USB_ETHER
 #define CONFIG_USB_ETH_RNDIS
 #define CONFIG_USBNET_HOST_ADDR	"de:ad:be:af:00:00"
-#endif /* CONFIG_DM_ETH */
 #endif /* CONFIG_USB_MUSB_GADGET */
 
 /*