drivers: versal_net: pki: Add driver for Versal NET PKI Accelerator

The Versal NET variant comes with a dedicated PKI engine. This driver makes
use of the engine for ECDSA P-256, P-384, and P-521 si

drivers: versal_net: pki: Add driver for Versal NET PKI Accelerator

The Versal NET variant comes with a dedicated PKI engine. This driver makes
use of the engine for ECDSA P-256, P-384, and P-521 sign, verify and key
generation operations.

Largely based on previous work by
Jeremie Corbier <jeremie.corbier@provenrun.com>.

For now, this commit omits the previous work's direct (memory-mapped) use
of one of the dedicated TRNG instances within the PKI Accelerator. Support
for it is to be added later. Instead the regular system random number
generator is used (=> crypto_rng_read()).

Signed-off-by: Joachim Foerster <joachim.foerster@missinglinkelectronics.com>
Reviewed-by: Nathan Menhorn <nathan.menhorn@amd.com>
Tested-by: Nathan Menhorn <nathan.menhorn@amd.com>
Reviewed-by: Sean McGinn <sean.mcginn@amd.com>
Reviewed-by: Lucas Kiker <lucas.kiker@amd.com>
Reviewed-by: Sindhu Raveendra <Sindhu.Raveendra@amd.com>
Reviewed-by: Clemens Nasenberg <clemens.nasenberg@amd.com>
Reviewed-by: Jorge Ramirez-Ortiz <jorge.ramirez@oss.qualcomm.com>

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