net.h: Include linux/if_ether.h to avoid duplication

There are plenty of existing drivers that have macros like ETH_ALEN
defined in their own source files. Now that we imported the kernel's
if_ether.h to U-Boot we can reduce some duplication.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/usb/eth/lan7x.h b/drivers/usb/eth/lan7x.h
index d1b1047..7af610b 100644
--- a/drivers/usb/eth/lan7x.h
+++ b/drivers/usb/eth/lan7x.h
@@ -94,7 +94,7 @@
 #define LAN7X_MAC_RX_MAX_SIZE(mtu) \
 	((mtu) << 16)			/* Max frame size */
 #define LAN7X_MAC_RX_MAX_SIZE_DEFAULT \
-	LAN7X_MAC_RX_MAX_SIZE(ETH_FRAME_LEN + 4 /* VLAN */ + 4 /* CRC */)
+	LAN7X_MAC_RX_MAX_SIZE(PKTSIZE_ALIGN + 4 /* VLAN */ + 4 /* CRC */)
 
 /* Timeouts */
 #define USB_CTRL_SET_TIMEOUT_MS		5000