Passing arugments to the STATE_MAP_ENTRIES that aren't void raises warnings

[mcgdb]

Hello,

In the motor example, this warning is raised by GCC when passing the MotorData* to the function pointer contained within the array for holding the State Map.

initialization of 'void (*)(SM_StateMachine *, void *)' from incompatible pointer type 'void (*)(SM_StateMachine *, MotorData *)'

[endurodave]

Fixed compiler warnings.