dts: imx8mp-rsb3720: modify configrations to load fip into memory

The changes of commit 6a21c695213b ("arm: dts: imx8mp: add of-list
support to common imx8mp-u-boot.dtsi") breaks the loading of the fip.
This commit fixes the break by modify the configuration properly.

Signed-off-by: Ying-Chun Liu (PaulLiu) <paul.liu@linaro.org>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP i.MX U-Boot Team <uboot-imx@nxp.com>
Reviewed-by: Fabio Estevam <festevam@denx.de>
diff --git a/arch/arm/dts/imx8mp-rsb3720-a1-u-boot.dtsi b/arch/arm/dts/imx8mp-rsb3720-a1-u-boot.dtsi
index 4419967..32d9fbc 100644
--- a/arch/arm/dts/imx8mp-rsb3720-a1-u-boot.dtsi
+++ b/arch/arm/dts/imx8mp-rsb3720-a1-u-boot.dtsi
@@ -158,12 +158,10 @@
 					};
 				};
 			};
-
-			configurations {
-				conf {
-					loadables = "atf", "fip";
-				};
-			};
 		};
 	};
 };
+
+&binman_configuration {
+	loadables = "atf", "fip";
+};