perf arch events: riscv sbi firmware std event files

Firmware events are defined by "RISC-V Supervisor Binary Interface
Specification", which means they should be always available as long as
firmware supports >= 0.3.0 SBI.

Expose them to arch std events, so they can be reused by particular PMU
bindings.

Signed-off-by: Nikita Shubin <[email protected]>
Tested-by: Kautuk Consul <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Cc: Albert Ou <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Anup Patel <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Paul Walmsley <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

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