Drop the special am335x_boneblack_vboot target

Now that am335x_evm boots OK on the Beaglebone black, drop the latter
and update the docs to cover the change.

Also add a few updates about 'make fit' and drop the note about the
security review, as U-Boot's verified boot has had quite extensive
review now.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Tom Rini <[email protected]>

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