xilinx_mbv: Remove empty config header

Now that we support having CONFIG_SYS_CONFIG_NAME be unset to indicate a
lack of board.h file, unset this on the xilinx_mbv platforms and remove
the otherwise empty file.

Signed-off-by: Tom Rini <trini@konsulko.com>
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Cc: Michal Simek <michal.simek@amd.com>
2 files changed