Enable Driver Model SPI for ls1021aqds board.
DSPI and QSPI is enabled only when boot from QSPI.
DSPI and QSPI are compatible under Driver Model SPI.
Signed-off-by: NHaikun Wang <Haikun.Wang@freescale.com>
Tested-by: NHaikun Wang <haikun.wang@freescale.com>
Reviewed-by: NJagan Teki <jteki@openedev.com>