zynq: remove hard-coded network configuration

This is no longer necessary since commit 57776e68
(base-files: remove default /etc/config/network,
generate it via board.d instead)

Run-tested: ZedBoard

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

target/linux/zynq/base-files.mk

-define Package/base-files/install-target
-	rm -f $(1)/etc/config/network
-endef

target/linux/zynq/base-files/etc/config/network

-# Copyright (C) 2015 OpenWrt.org
-
-config interface loopback
-	option ifname	lo
-	option proto	static
-	option ipaddr	127.0.0.1
-	option netmask	255.0.0.0
-
-config interface lan
-	option ifname	eth0
-	option proto	static
-	option ipaddr	192.168.1.1
-	option netmask	255.255.255.0
-	option ip6assign 60
-
-config globals globals
-	option ula_prefix auto