riscv: Add 3 SBI wrapper functions to get cpu manufacturer information
Add 3 wrapper functions to get vendor id, architecture id and implement id from M-mode Signed-off-by:Vincent Chen <vincent.chen@sifive.com> Reviewed-by:
Anup Patel <anup@brainfault.org> Signed-off-by:
Palmer Dabbelt <palmerdabbelt@google.com>
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