This is because Processor Expert for ColdFireV1 is not fully integrated with MQX yet. In your case, you can try to include PE_Types.h file generated from Processor Expert. This file contains appropriate register access macros like getRegxx. You can also extract only necessary macros from this file directly into your .c/.h file.
See also this topic. It might help.
https://community.freescale.com/message/87924#87924
Marek V.