[Feature Add] add dynamixl/lewansoul serial bus connector

[madhephaestus]

https://github.com/tve/lx16a-servo/blob/master/lx-16a%20LewanSoul%20Bus%20Servo%20Communication%20Protocol.pdf

This connector should be connected to the second serial port. Add jumpers to jumper it into or completely removed if the jumpers are removed. This will add PHY support for Dynamixl and LewanSoul serial servos.