arm: do not force d-cache enable on all boards
c2dd0d45 added dcache_enable() to board_init_r(). This enables d-cache for all ARM boards. As a result some of the arm boards that are not cache-ready are broken. Revert this change and allow platform code to take the decision on d-cache enabling. Also add some documentation for cache usage in ARM. Signed-off-by: NAneesh V <aneesh@ti.com>
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doc/README.arm-caches
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