Revert "sam_e70: enable instruction and data caches on sam_e70" #9688
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Reverts #9647
We need to revert this PR. seems to be breaking a few things inside sam e70.
We can recreate this PR once we understand how the cache is behaving when the MPU is turned on.
Currently all MPU regions always disable the cache. So when we enable the cache in soc init and disable them in the mpu regions init. We might be causing some issue.
Until root cause is found we should revert this.
This reverts commit c090776.