riscv: hwprobe: export Zawrs ISA extension

Export Zawrs ISA extension through hwprobe.

[Palmer: there's a gap in the numbers here as there will be a merge
conflict when this is picked up.  To avoid confusion I just set the
hwprobe ID to match what it would be post-merge.]

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Clément Léger <cleger@rivosinc.com>
Link: https://lore.kernel.org/r/20240426100820.14762-12-ajones@ventanamicro.com


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>