fixed dtbo copy issue with pynq package

[jogomojo]

Fixed issue in pynq package where if dtbo files didn't exist in the repo the image build process would fail.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.97%. Comparing base (6ea63cf) to head (afcacbd).
⚠️ Report is 2 commits behind head on image_v3.1.1.
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Additional details and impacted files

@@               Coverage Diff                @@
##           image_v3.1.1    #1501      +/-   ##
================================================
- Coverage         34.98%   34.97%   -0.01%     
================================================
  Files                30       30              
  Lines              4668     4669       +1     
  Branches            818      818              
================================================
  Hits               1633     1633              
- Misses             2975     2976       +1     
  Partials             60       60              

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