forked from Mirrors/opensbi

Add PMU node example for event index to counter index mapping and selector value translation of Andes' CPUs. Currently, there are 4 HPM counters that can be used to monitor all of the events for each hart. Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com> Reviewed-by: Locus Wei-Han Chen <locus84@andestech.com> Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com> Reviewed-by: Anup Patel <anup@brainfault.org> Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>