Marvel: Convert UNI files from UTF-16 to UTF-8

https://bugzilla.tianocore.org/show_bug.cgi?id=2199



Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>