1. base on 190412_v5;
2. used wsm2.6.2 and WFV3918_SKYWORKS_PA_V2 sdd.
3. add on video storage
4. add a web server and a simple configure web page
5. add a "serial_test" script tool to test tty2.when running once ,output firmware version
6. the "serial_test" tool is under dir /etc/jffs2
7. the web page under dir /etc/jffs2/www,and the cgi program under /etc/jffs2/www/cgi-bin