Changeset be8cbbf in rtems for c/src/libchip/serial

Switched deviceOutputUsesInterrupts to TRUE so output would be interrupt
driven.

Redid "mate determination" code to check that the chip base address was
the same but the port address was different.

Moved mc68681_process and mc68681_build_imr to the bottom of the file
so they would not be inlined.

Removed the code which forced mc68681_build_imr to always return 0 which
resulted in interrupts never being enabled from the chip.

Corrected spacing in prototype of mc68681_write_support_int.