configs: rockchip: rk3308: use CONFIG_DEFAULT_FDT_FILE

all rk3308 boards should use their own dtb file.

also, change fdt_addr_r to avoid following error:
 "ERROR: Did not find a cmdline Flattened Device Tree"
it happens on Radxa ROCK Pi S (256MB/512MB) with kernel built from
Radxa BSP.

Signed-off-by: FUKAUMI Naoki <naoki@radxa.com>
diff --git a/include/configs/rk3308_common.h b/include/configs/rk3308_common.h
index 7d55fcd..a413af1 100644
--- a/include/configs/rk3308_common.h
+++ b/include/configs/rk3308_common.h
@@ -16,11 +16,12 @@
 #define ENV_MEM_LAYOUT_SETTINGS \
 	"scriptaddr=0x00500000\0" \
 	"pxefile_addr_r=0x00600000\0" \
-	"fdt_addr_r=0x02800000\0" \
+	"fdt_addr_r=0x03e00000\0" \
 	"kernel_addr_r=0x00680000\0" \
 	"ramdisk_addr_r=0x04000000\0"
 
 #define CFG_EXTRA_ENV_SETTINGS \
+	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \
 	ENV_MEM_LAYOUT_SETTINGS \
 	"partitions=" PARTS_DEFAULT \
 	ROCKCHIP_DEVICE_SETTINGS \