(chore)make pca9685 address configurable

[ranjib]

No description provided.

[theatrus]

Note to self: backport in #662

[codecov-io]

Codecov Report

Merging #665 into master will increase coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #665      +/-   ##
==========================================
+ Coverage   83.52%   83.56%   +0.04%     
==========================================
  Files         219      220       +1     
  Lines        6749     6772      +23     
  Branches      477      477              
==========================================
+ Hits         5637     5659      +22     
- Misses        824      825       +1     
  Partials      288      288

Flag	Coverage Δ
#go	74.93% <0%> (+0.13%)	⬆️
#javascript	92.46% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
jsx/configuration/settings_schema.jsx	100% <ø> (ø)	⬆️
jsx/configuration/settings.jsx	97.33% <ø> (ø)	⬆️
controller/settings.go	90.9% <ø> (ø)	⬆️
controller/reef_pi.go	62.6% <0%> (-0.55%)	⬇️
controller/utils/dev_mode.go	100% <0%> (ø)

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