add support for btt MMB v1.1

[Zchulski]

Describe the feature or hardware support you'd like

We need to get support for the BTT MMB v1.1 i spent 2 days trying to get the gear stepper to work only to realize they changed the pins between STP4 and MCU_M1_EN.

Additional context or information

the only issue I have found wrong currently is that the CANBUS definitions are wrong. MCU_M1_EN is not STP4 and vice versa