[PATCH 1/2] riscv: provide missing base extension functions

[Leo Liang]

On Tue, Jul 20, 2021 at 04:28:34AM +0800, Heinrich Schuchardt wrote:
> Provide library functions to read:
> 
> * SBI implementation version
> * machine vendor ID
> * machine architecture ID
> * machine implementation ID
> 
> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>

Reviewed-by: Leo Yu-Chi Liang <ycliang at andestech.com>