Fix am43x minimal booting as I accidentally left out one

patch from the already merged omap-for-v3.11/soc-signed branch.
Also fixes for ti81x booting and  revision check updates.

These are based on omap-for-v3.11/soc-signed because of the
am43x dependency to earlier patches.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
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=4brz
-----END PGP SIGNATURE-----