python3-adafruit-blinka: Fix the correct python recipes path in dynamic-layer sub-dir

The python recipes in the dynamic-layer need one more subdirectory
to be in accordance with the defined in the layer settings.

The recipes moved to new python sub-dir are:
python3-adafruit-blinka
python3-adafruit-circuitpython-busdevice
python3-adafruit-circuitpython-motor
python3-adafruit-circuitpython-motorkit
python3-adafruit-circuitpython-pca9685

Signed-off-by: Rodrigo M. Duarte <rodrigo.duarte@ossystems.com.br>