mc6852 - implement more functionality, add byte interface. #6931
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This adds functionality needed to support a Motorola m68sfdc floppy disk controller emulator. It adds byte sized functions for sending and receiving data as these are a practical size for the FDC emulation. It should not regress any existing functionality and does not touch the serial interface which appears to be only a skeleton. Various issues TODO are noted. It has been tested on a m68sfdc emulator running EXORciser firmware.