armv8/ls2085a/defconfig: Enable FSL_DSPI, OF_CONTROL and DM support

Freescale DSPI driver has been converted to Driver Model.
The new driver depends on OF_CONTROL, DM, DM_SPI.
This patch enable FSL_DSPI and its dependence configure options.

Signed-off-by: Haikun Wang <haikun.wang@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>