board_f: Drop return value from initdram()

At present we cannot use this function as an init sequence call without a
wrapper, since it returns the RAM size. Adjust it to set the RAM size in
global_data instead, and return 0 on success.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/freescale/ls2080aqds/ddr.c b/board/freescale/ls2080aqds/ddr.c
index bd32c54..1e9145d 100644
--- a/board/freescale/ls2080aqds/ddr.c
+++ b/board/freescale/ls2080aqds/ddr.c
@@ -155,17 +155,15 @@
 	}
 }
 
-phys_size_t initdram(void)
+int initdram(void)
 {
-	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();
 #else
 	puts("Initializing DDR....using SPD\n");
 
-	dram_size = fsl_ddr_sdram();
+	gd->ram_size = fsl_ddr_sdram();
 #endif
 
-	return dram_size;
+	return 0;
 }