RISC-V: KVM: Change the SBI specification version to v1.0

The SBI v1.0 specificaiton is functionally same as SBI v0.3
specification except that SBI v1.0 specification went through
the full RISC-V International ratification process.

Let us change the SBI specification version to v1.0.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>