arm: imx7s-warp: Add DT file hooks

This patch adds DT file hooks for imx7s-warp.dtb to the warp7 and
warp7_bl33 builds.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Peng Fan <peng.fan@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/configs/warp7_bl33_defconfig b/configs/warp7_bl33_defconfig
index 769aeb3..3624b13 100644
--- a/configs/warp7_bl33_defconfig
+++ b/configs/warp7_bl33_defconfig
@@ -21,6 +21,7 @@
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
+CONFIG_OF_CONTROL=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DFU_MMC=y
@@ -38,5 +39,5 @@
 CONFIG_USB_ETHER=y
 CONFIG_USB_ETH_CDC=y
 CONFIG_USBNET_HOST_ADDR="de:ad:be:af:00:00"
-CONFIG_OF_LIBFDT=y
 CONFIG_OPTEE_TZDRAM_SIZE=0x2000000
+CONFIG_DEFAULT_DEVICE_TREE="imx7s-warp"
diff --git a/configs/warp7_defconfig b/configs/warp7_defconfig
index 8c2efe5..66533de 100644
--- a/configs/warp7_defconfig
+++ b/configs/warp7_defconfig
@@ -30,6 +30,7 @@
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_CMD_FAT=y
+CONFIG_OF_CONTROL=y
 CONFIG_CMD_FS_GENERIC=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DFU_MMC=y
@@ -48,8 +49,8 @@
 CONFIG_USB_ETHER=y
 CONFIG_USB_ETH_CDC=y
 CONFIG_USBNET_HOST_ADDR="de:ad:be:af:00:00"
-CONFIG_OF_LIBFDT=y
 CONFIG_OPTEE_LOAD_ADDR=0x84000000
 CONFIG_OPTEE_TZDRAM_SIZE=0x3000000
 CONFIG_OPTEE_TZDRAM_BASE=0x9d000000
 CONFIG_BOOTM_OPTEE=y
+CONFIG_DEFAULT_DEVICE_TREE="imx7s-warp"