ARM: imx6: DHCOM i.MX6 PDK: config SPL to load U-Boot fitImage with mulitple DTs

Configure fitImage for U-Boot with a device tree for imx6 quad/dual
and duallite/solo. This enables to support the imx6 derivates
quad/dual/duallite/solo with a single binary.

Signed-off-by: Ludwig Zenz <lzenz@dh-electronics.com>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/configs/dh_imx6_defconfig b/configs/dh_imx6_defconfig
index 77b5afd..387ab84 100644
--- a/configs/dh_imx6_defconfig
+++ b/configs/dh_imx6_defconfig
@@ -16,6 +16,7 @@
 CONFIG_DISTRO_DEFAULTS=y
 # CONFIG_SYS_MALLOC_F is not set
 CONFIG_FIT=y
+CONFIG_SPL_FIT=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=arch/arm/mach-imx/spl_sd.cfg"
 CONFIG_BOOTDELAY=3
 # CONFIG_USE_BOOTCOMMAND is not set
@@ -41,6 +42,8 @@
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_OF_CONTROL=y
 CONFIG_DEFAULT_DEVICE_TREE="imx6q-dhcom-pdk2"
+CONFIG_OF_LIST="imx6q-dhcom-pdk2 imx6dl-dhcom-pdk2"
+CONFIG_MULTI_DTB_FIT=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_DWC_AHSATA=y
 CONFIG_BOOTCOUNT_LIMIT=y