Add RISC-V specific implementation of arch_get_random_value() that
combines entropy from rdcycle and rdtime counters. This provides a
portable solution since the Zkr entropy extension is optional in RVA23
profile.
Tracked-On: #8834
Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>
