OpenWrt support for NanoPi R2C

Thanks. I build a patched image and use the friendly core eflasher image to install openwrt on emmc. Instructions are on the R2C wiki.
The only change when I made it was in the LED settings.

config led 'led_wan'
        option name 'WAN'
        option sysfs 'nanopi-r2s:green:wan'
        option trigger 'netdev'
        option dev 'eth0'
        list mode 'link'
        list mode 'tx'
        list mode 'rx'

config led 'led_lan'
        option name 'LAN'
        option sysfs 'nanopi-r2s:green:lan'
        option trigger 'netdev'
        option dev 'eth1'
        list mode 'link'
        list mode 'tx'
        list mode 'rx'