Documentation: riscv: Add early boot document

This document describes the constraints and requirements of the early
boot process in a RISC-V kernel.

Signed-off-by: Alexandre Ghiti <[email protected]>
Reviewed-by: Björn Töpel <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Sunil V L <[email protected]>
Reviewed-by: Andrew Jones <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Reviewed-by: Atish Patra <[email protected]>
Reviewed-by: Song Shuai <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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