Clear found drivers in manager on each initialize call (Darwin)

[hexbabe]

Description

In camera_linux.go, we clear all registered camera devices to prevent duplicates each time Initialize is called. We should do the same for Darwin

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 45.87%. Comparing base (c10fb00) to head (a4a536c).

Files with missing lines	Patch %	Lines
pkg/driver/camera/camera_darwin.go	50.00%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #605      +/-   ##
==========================================
+ Coverage   44.67%   45.87%   +1.20%     
==========================================
  Files          80       77       -3     
  Lines        5498     4955     -543     
==========================================
- Hits         2456     2273     -183     
+ Misses       2875     2522     -353     
+ Partials      167      160       -7     

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