net/ntnic: add registers and FPGA model

The NTNIC PMD does not rely on a kernel space Napatech driver,
thus all defines related to the register layout is part of the PMD
code, which will be added in

net/ntnic: add registers and FPGA model

The NTNIC PMD does not rely on a kernel space Napatech driver,
thus all defines related to the register layout is part of the PMD
code, which will be added in later commits.

Signed-off-by: Serhii Iliushyk <sil-plv@napatech.com>
Reviewed-by: Ferruh Yigit <ferruh.yigit@amd.com>

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