dt-bindings: riscv: update ratified version of h, svinval, svnapot, svpbmt

dt-bindings: riscv: update ratified version of h, svinval, svnapot, svpbmt

The descriptions for h, svinval, svnapot, and svpbmt extensions currently
reference the "20191213 version of the privileged ISA specification".
While an Unprivileged ISA document exists with that date, there is no
corresponding ratified Privileged ISA specification.

These extensions were ratified in the RISC-V Instruction Set Manual,
Volume II: Privileged Architecture, Version 20211203. Update the
descriptions to reference the correct specification version.

RISC-V International hosts a website [1] for ratified specifications.
Following the "Ratified ISA Specifications", historical versions of
Volume II Privileged ISA can be found.

Link: https://riscv.org/specifications/ratified/
Fixes: aeb71e42caae ("dt-bindings: riscv: deprecate riscv,isa")
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>