armv8: layerscape: Fix DDR size calcuation for SPL build

Commit 088454cd dropped return value from initram(), setting
gd->ram_size directly. Three boards were missed for SPL boot.

Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1046aqds/ddr.c b/board/freescale/ls1046aqds/ddr.c
index d37af34..5fcfa0f 100644
--- a/board/freescale/ls1046aqds/ddr.c
+++ b/board/freescale/ls1046aqds/ddr.c
@@ -97,7 +97,9 @@
 	phys_size_t dram_size;
 
 #if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
-	return fsl_ddr_sdram_size();
+	gd->ram_size = fsl_ddr_sdram_size();
+
+	return 0;
 #else
 	puts("Initializing DDR....using SPD\n");