include/dt-bindings: Remove headers we can safely upgrade

include/dt-bindings: Remove headers we can safely upgrade

As part of moving to using OF_UPSTREAM and so the upstream dt-bindings
headers we have a number of these headers that are in our include
directory and while they are not a strict subset of the upstream version
of the headers, all platforms build with the new headers as well. We can
remove the copies under include/dt-bindings now to prevent future
conflicts.

Signed-off-by: Tom Rini <trini@konsulko.com>