BRD_PWM_COUNT still in hwdef.dat

Just a heads up - brd_pwm_count is still mentioned in hwdef.dat.

I don’t recall exactly how I did it, but I seem to recall having to look up this file to determine that the GPIO pin I needed for my camera shutter was 55.

With the changes to copter 4.2.0-rc1, I don’t know yet if there’s anywhere I’ll need to refer specifically to GPIO pin 55. Maybe the new parameter options handle this automatically now.

The comment should probably be edited. See my PR for this issue.

Pin labeling is mentioned in the parameter documentation.

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