configs: microchip_mpfs_icicle: set DEFAULT_FDT_FILE

Variable $fdtfile needs to be set for automatically loading a device-tree
from the ESP or boot partition.

* Set CONFIG_DEFAULT_FDT_FILE in the defconfig.
* Add $fdtfile to the default environment.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/configs/microchip_mpfs_icicle_defconfig b/configs/microchip_mpfs_icicle_defconfig
index 5ea6cc3..f8acaa9 100644
--- a/configs/microchip_mpfs_icicle_defconfig
+++ b/configs/microchip_mpfs_icicle_defconfig
@@ -12,6 +12,7 @@
 CONFIG_RISCV_SMODE=y
 CONFIG_FIT=y
 CONFIG_DISTRO_DEFAULTS=y
+CONFIG_DEFAULT_FDT_FILE="microchip/mpfs-icicle-kit.dtb"
 CONFIG_SYS_CBSIZE=256
 CONFIG_SYS_PBSIZE=282
 CONFIG_DISPLAY_CPUINFO=y
diff --git a/include/configs/microchip_mpfs_icicle.h b/include/configs/microchip_mpfs_icicle.h
index 5ced45b..0077f6a 100644
--- a/include/configs/microchip_mpfs_icicle.h
+++ b/include/configs/microchip_mpfs_icicle.h
@@ -26,6 +26,7 @@
 	"scriptaddr=0x88100000\0" \
 	"pxefile_addr_r=0x88200000\0" \
 	"ramdisk_addr_r=0x88300000\0" \
+	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
 	BOOTENV
 
 #endif /* __CONFIG_H */