native_motor_driver_qdec_simulation() callback is called each time
motor_set() from motor_driver driver is called.
It set associated qdec value to the PWM duty cycle.
QDEC values are stored in qdecs_value[] array in the order motors
are described in board.h.
Then it is needed to configure in first motors that needs the QDEC in
board.h.
Signed-off-by: Gilles DOFFE <g.doffe@gmail.com>
