7054 support

[fenugrec]

This is just a checklist of things to do. I am not planning on working on this myself. I expect 7054 will be very similar to either 7051 or 7055_35.

• look at ROM dump to see what RAM location is typically used for payload (in WE85C , looks like ffff8428 ; fairly typical ?) and other details pre-ramjump
• ensure sufficient RAM
• add register defines
• if necessary, add interrupt vectors
• implement platform-specific code either as a subset of 7051, 7055_35 or as a separate file if too different
• if reusing 7051 or 7055 flash code, make absolutely sure the needed constants (such as delays, loop counts etc) follow the 7054 datasheet
• test

[fenugrec]

eh, I had some wastable time and took care of the easy stuff. Incomplete, will not work. https://github.com/fenugrec/npkern/tree/7054