spi_mpc8xxx: Setting cs_change at the last transfer of a message

[Torsten Fleischer]

As stated in spi.h (at struct spi_transfer) the driver can keep the chip 
select of the last device active if cs_change is set at the last transfer of a 
message.
The spi_mpc8xxx driver always deactivates the chip select after completing the 
message regardless of cs_change is set or not.

I'd like to patch this. But before doing that I'd like to learn if there are 
any known use cases where the above described behavior of the driver is 
needed.


Thanks
Torsten