Drop few unused omap board files. The support for ti81xx is known to

be incomplete and broken, and the 3430sdp is only used in few automated
boot test systems AFAIK and those have been booting in device tree only
mode for quite some time now.

Note that this branch has a dependency to the related device tree
changes and GPMC changes sent in a separate pull request.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=yb48
-----END PGP SIGNATURE-----