#21 update deprecated SPI drivers for BF5xx

[Aaron.Wu]

This is a customer request from engineerzone: http://ez.analog.com/message/142299

abstract:

I'm using the 2013R1 kernel and I get a message from the bfin-spi during startup:

Oct 30 17:07:42 kernel: bfin-spi bfin-spi.0: master is unqueued, this is deprecated
Oct 30 17:07:42 kernel: bfin-spi bfin-spi.0: Blackfin on-chip SPI Controller Driver, Version 1.0