sched/doc: supplement CPU capacity with RISC-V

This commit 7d2078310cbf ("dt-bindings: arm: move cpu-capacity to a
shared loation") updates some references about capacity-dmips-mhz
property in this document.

The list of architectures using capacity-dmips-mhz omits RISC-V, so
supplements it here.

Signed-off-by: Song Shuai <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]> # English
Acked-by: Palmer Dabbelt <[email protected]>
Reviewed-by: Alex Shi <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>

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