riscv: Add documentation for Vector

This patch add a brief documentation of the userspace interface in
regard to the RISC-V Vector extension.

Signed-off-by: Andy Chiu <[email protected]>
Reviewed-by: Greentime Hu <[email protected]>
Reviewed-by: Vincent Chen <[email protected]>
Co-developed-by: Bagas Sanjaya <[email protected]>
Signed-off-by: Bagas Sanjaya <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

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