License: Add the Open Font License

This is used by two of the font files. Add this license to permit tracking
of this. The copyright text cannot be added to the .ttf files, so put it
here.

Signed-o

License: Add the Open Font License

This is used by two of the font files. Add this license to permit tracking
of this. The copyright text cannot be added to the .ttf files, so put it
here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Anatolij Gustschin <agust@denx.de>

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