[HACK] roth: init display clocks

Necessary to keep the display on after boot

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
[HACK] mmc: do not expose rpmb partitions

Some user-spaces (e.g. OpenSUSE 13.1) try to read them and get errors.
Need to figure out who is to blame here.
Add README.md

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