MPC860: quicc_smc_serial_driver change

[nprasad3@gmu.edu]

> Possibly (I wrote the driver), but probably long since discarded
> as a useful mode.
> 
This mode turns out to be very useful to me. I have only 1 port SCC1 that can be used by the diag interface as well as printf. I used the hal_diag.c from mbx port and it does not work with the interrupt driven driver so when I started with the interrupt driven driver, it would go hang because of the diag_printf.
> > 
> > I started with the polling mode driver as I thought it would be 
> > easy to get it going on my target first. 
> 
> What is there to get going?  This is all common 860/QUICC stuff,
> and there shouldn't need to be any platform specifics required.
> 
Anyways I do have the interrupt mode driver working now but only by disabling diags. I have to see how to make the 2 co-exist on one port (probably polling mode driver for debugging).

Thanks
Nirmal