KVM: riscv: selftests: Use register subtypes

Always use register subtypes in the get-reg-list test when registers
have them. The only registers neglecting to do so were ISA extension
registers. While we don't really need to use KVM_REG_RISCV_ISA_SINGLE
(since it's zero), the main purpose is to avoid confusion and to
self-document the tests. Also add print support for the multi
registers like SBI extensions have, even though they're only used for
debugging.

Signed-off-by: Andrew Jones <[email protected]>
Reviewed-by: Haibo Xu <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Signed-off-by: Anup Patel <[email protected]>

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