Dpaa2 driver using system("echo...")

[Stephen Hemminger]

When the CodeQl (https://codeql.github.com/) is run against DPDK,
one of the issues it reports is the unsafe usage of system() in code.

I reported and fixed one of these issues in the dpaa2 driver
https://patchwork.dpdk.org/project/dpdk/patch/20220602214957.150071-1-stephen@networkplumber.org/
but it seems to have been ignored.

Could one of the maintainers of that driver review it?