Wrong enum used for axis configuration

[benlaurie]

Many headers use, for example:

define M2_MOTOR_MAP AXIS_Y

This works, but is wrong - it should be AXIS_Y_EXTERNAL.

It matters once you get to A, B, C axes - AXIS_A is 6 (which is wrong), whereas AXIS_A_EXTERNAL is 3 (which is right).

[ril3y]

Thanks I will take a look at this. @benlaurie what are you working on these days?