uboot-phytec

microblaze: Enable cache by default

The whole cache code needs to be redesign to read information about cache
from DT instead of macro selection. Enable caches by default because
systems have caches on by default for Linux.

Also enable CMD_CACHE to be able to disable cache if there is any issue.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>