riscv: rpmi.h: add defines of RISC-V RPMI messaging protocol

The RPMI messaging protocol includes all the RPMI messages exchanged
over a RPMI transport channel.

*NOTE*: The RISC-V RPMI specificatio

riscv: rpmi.h: add defines of RISC-V RPMI messaging protocol

The RPMI messaging protocol includes all the RPMI messages exchanged
over a RPMI transport channel.

*NOTE*: The RISC-V RPMI specification is not yet ratified
as a full standard. This is based on the v0.99 draft released during
May–June 2025 The draft is frozen and in public review.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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