riscv: cache: Implement i/dcache [status, enable, disable] AndeStar RISC-V(V5) provide mcache_ctl... If you want to configure cache on AndeStar V5 AE350 platform. YOu can enable [*] AndeStar V5 ISA support Signed-off-by: Rick Chen <rick@andestech.com> Cc: Greentime Hu <greentime@andestech.com>