RISC-V: Add basic support for SBI v0.2
The SBI v0.2 introduces a base extension which is backward compatible with v0.1. Implement all helper functions and minimum required SBI calls from v0.2 for now. All other base extension function will be added later as per need. As v0.2 calling convention is backward compatible with v0.1, remove the v0.1 helper functions and just use v0.2 calling convention. Signed-off-by: NAtish Patra <atish.patra@wdc.com> Reviewed-by: NAnup Patel <anup@brainfault.org> Reviewed-by: NPalmer Dabbelt <palmerdabbelt@google.com> Signed-off-by: NPalmer Dabbelt <palmerdabbelt@google.com>
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