Suggest you backing up the default 7.1.3 plugin.
Then use "sudo ln -s xxx xxx " to generate the expected I mentioned above.
For example,
$ cd /usr/lib/aarch64-linux-gnu
$ sudo ln -s libnvinfer_plugin.so.7.1.3 /usr/lib/aarch64-linux-gnu/libnvinfer_plugin.so
$ sudo ln -s libnvinfer_plugin.so.7.1.3 /usr/lib/aarch64-linux-gnu/libnvinfer_plugin.so.7
$ sudo ln -s libnvinfer_plugin.so.7.1.3 /usr/lib/aarch64-linux-gnu/libnvinfer_plugin.so.7.0.0