forked from Mirrors/opensbi

The "event_idx" member of struct sbi_pmu_fw_event is not used anywhere so let us remove it. Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Reviewed-by: Atish Patra <atishp@rivosinc.com>