RISC-V: KVM: Add support for SBI extension registers

Some SBI extensions have state that needs to be saved / restored
when migrating the VM. Provide a get/set-one-reg register type
for SBI extension registers. Each SBI extension that uses this type
will have its own subtype. There are currently no subtypes defined.
The next patch introduces the first one.

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

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