BaseTools/PeCoffLoader: fix handling of ARM MOVW/MOVT instruction relocs

BaseTools/PeCoffLoader: fix handling of ARM MOVW/MOVT instruction relocs

The handling of ARM MOVW/MOVT relocations sets the FixupData twice (once
incorrectly), but fails to advance the *FixupData pointer afterwards.
This is not actually a problem, since the fixup data is never used but
let's fix it anyway in case anyone reuses this code.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18596 6f19259b-4bc3-4df7-8a09-765794883524