Fix parsing File() nodes in device paths.
o Add File to the mUefiDevicePathLibDevPathFromTextTable table so we
don't include 'File()' in the supposed path name. This happens because of a possible misfeature in the EDK2 code where any path that's not recognized is treated as a File() node.
o Convert utf8 input into ucs2 output rather than just copying the
utf8 and hoping for the best (no good comes from that).
o Remove bogus comment about needing to add 1. The dummy array already
is length 1, so that's included in sizeof the struct, so there's no need to add it.
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