[U-Boot] Patch to mkenvimage to handle text files with length that exceed env size

[Brian McFarland]

The current head revision of mkenvimage
(e72be8947e129f5ab274c0a9f235d2cc0014b2ea) will prevent you from creating
an env image from a text file that is larger than the env length specified
by the '-s' option.  That doesn't make sense given that the tool now allows
comments and blank lines.  This patch removes that limitation and allows
longer text files to be used.

I don't have time / desire at the moment to figure out "patman" and could
really care less if this is adopted up stream.  Just figured I would share
in case anybody else finds it useful enough to take time to do a proper
patch.
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