Add KNI Kernel Modules to DPDK build

[jsthomas1]

https://doc.dpdk.org/guides-21.11/prog_guide/kernel_nic_interface.html

The Kernel Network Interface "KNI" kernel module should be built by adding "-Denable_kmods=true -Dkernel_dir=/path/to/kernel/build/dir" to the DPDK meson configuration command.

https://github.com/SolidRun/cn913x_build/blob/93008bfe927670788d2a5b1ce4fe056600ff5cdf/runme.sh#L377C1-L377C94