even if the line size of Icache and Dcache is different, it was fixed to work correctly.

- MAX(IcacheShift,DcacheShift) is wrong and should be MIN(IcacheShift,DcacheShift).
  Dcache and Icache are now done in independent loops instead of in the same loop.
- simplify the handling of cache_handle_range() macro arguments.
- cache_handle_range macro doesn't include "ret" anymore.

(ryo)