ramips: Add support for ZTE Q7

ramips: Add support for ZTE Q7

ZTE Q7 is a wireless router with SD Card,USB,1 ethernet port and a battery.It used MT7620a SoC.
I can,t find any information about this router on ZTE's website.
But I found this : http://en.cctairmobi.com/plus/list.php?tid=40
This router is the same as ZTE Q7 and later I found that both routers are made by the same company:-D

This patch adds support for it.
Because there is only one port,I disabled VLAN and use eth0 as lan port.
I could only create a sysupgrade firmware because I don't know how the orignal webpage check the uploaded image:-(

Signed-off-by: 郭传鈜 <gch981213@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45208 3c298f89-4303-0410-b956-a3cf2f4a3e73