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>
diff --git a/configs/ls2085ardb_defconfig b/configs/ls2085ardb_defconfig
index 308e935..c7dae4b 100644
--- a/configs/ls2085ardb_defconfig
+++ b/configs/ls2085ardb_defconfig
@@ -1,4 +1,11 @@
 CONFIG_ARM=y
 CONFIG_TARGET_LS2085ARDB=y
+CONFIG_DEFAULT_DEVICE_TREE="fsl-ls2085a-rdb"
+# CONFIG_SYS_MALLOC_F is not set
 CONFIG_SYS_EXTRA_OPTIONS="SYS_FSL_DDR4"
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_OF_CONTROL=y
+CONFIG_DM=y
+CONFIG_DM_SPI_FLASH=y
+CONFIG_DM_SPI=y
+CONFIG_FSL_DSPI=y