forked from Mirrors/opensbi

Currently pmp_get() returns the log2 length of the PMP memory region size. The caller has to calculate the size based on that and the same codes are duplicated. Update this function to return decoded size directly. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>