arm: dts: imx8m: shrink ddr firmware size to actual file size

After we switch to use BINMAN_SYMBOLS, there is no need to pad
the file size to 0x8000 and 0x4000. After we use BINMAN_SYMBOLS,
the u-boot-spl-ddr.bin shrink about 36KB with i.MX8MP-EVK.

Tested-by: Tim Harvey <tharvey@gateworks.com> #imx8m[m,n,p]-venice
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>
diff --git a/arch/arm/dts/imx8mm-u-boot.dtsi b/arch/arm/dts/imx8mm-u-boot.dtsi
index c37a54e..f792b42 100644
--- a/arch/arm/dts/imx8mm-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-u-boot.dtsi
@@ -41,25 +41,25 @@
 
 		ddr-1d-imem-fw {
 			filename = "lpddr4_pmu_train_1d_imem.bin";
-			size = <0x8000>;
+			align-end = <4>;
 			type = "blob-ext";
 		};
 
 		ddr-1d-dmem-fw {
 			filename = "lpddr4_pmu_train_1d_dmem.bin";
-			size = <0x4000>;
+			align-end = <4>;
 			type = "blob-ext";
 		};
 
 		ddr-2d-imem-fw {
 			filename = "lpddr4_pmu_train_2d_imem.bin";
-			size = <0x8000>;
+			align-end = <4>;
 			type = "blob-ext";
 		};
 
 		ddr-2d-dmem-fw {
 			filename = "lpddr4_pmu_train_2d_dmem.bin";
-			size = <0x4000>;
+			align-end = <4>;
 			type = "blob-ext";
 		};
 	};