armv8/ls1043ardb: add DSPI support

Use the U-Boot Driver Model. Just enable Freescale DSPI driver
and set DSPI related parameters in dts file.

Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/configs/ls1043ardb_nand_defconfig b/configs/ls1043ardb_nand_defconfig
index 605dbc0..c4f5f60 100644
--- a/configs/ls1043ardb_nand_defconfig
+++ b/configs/ls1043ardb_nand_defconfig
@@ -3,3 +3,8 @@
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SPL_FSL_PBL,NAND_BOOT,SYS_FSL_DDR4"
 CONFIG_SYS_NS16550=y
+CONFIG_DEFAULT_DEVICE_TREE="fsl-ls1043a-rdb"
+CONFIG_OF_CONTROL=y
+CONFIG_DM=y
+CONFIG_SPI_FLASH=y
+CONFIG_DM_SPI=y