forked from Mirrors/opensbi

As-per latest RISC-V privilege spec up to 64 PMP entries are supported. Implementations may implement zero, 16, or 64 PMP CSRs. All PMP CSR fields are WARL and may be hardwired to zero. This patch improves PMP CSR detection and progamming considering above facts. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>