rk356x_sdk-linux5.10使用ubuntu22.04根文件系统，4G ping不通外网
按照网址:https://wiki.t-firefly.com/Core-3568J/linux_compile_linux5.10.html#编译烧录后，4G模组，
1、可以识别到/dev/ttyUSB0~/dev/ttyUSB3
2、root@firefly:/# ifconfig -a
wwan0: flags=128<NOARP>mtu 1500
ether a2:80:e9:cc:56:c5txqueuelen 1000(Ethernet)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0frame 0
TX packets 1bytes 56 (56.0 B)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
3、root@firefly:/# ifconfig wwan0 up
4、root@firefly:/# ifconfig
wwan0: flags=193<UP,RUNNING,NOARP>mtu 1500
inet6 fe80::a080:e9ff:fecc:56c5prefixlen 64scopeid 0x20<link>
ether a2:80:e9:cc:56:c5txqueuelen 1000(Ethernet)
RX packets 0bytes 0 (0.0 B)
RX errors 0dropped 0overruns 0frame 0
TX packets 3bytes 168 (168.0 B)
TX errors 0dropped 0 overruns 0carrier 0collisions 0
5、root@firefly:/# ping 8.8.8.8
ping: connect: Network is unreachable
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