Fix missing gpio.proto dependency in pynq-cpp.bb

[ironmanna]

Added a missing dependency of gpio.proto in pynq-cpp.bb file that caused build process to fail.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 34.69%. Comparing base (d340695) to head (6adad74).
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Additional details and impacted files

@@              Coverage Diff              @@
##           image_v3.1.3    #1531   +/-   ##
=============================================
  Coverage         34.69%   34.69%           
=============================================
  Files                30       30           
  Lines              4704     4704           
  Branches            826      826           
=============================================
  Hits               1632     1632           
  Misses             3012     3012           
  Partials             60       60           

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