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/xes/xpedite1000/xpedite1000.c b/board/xes/xpedite1000/xpedite1000.c
index ff64483..df5a7a0 100644
--- a/board/xes/xpedite1000/xpedite1000.c
+++ b/board/xes/xpedite1000/xpedite1000.c
@@ -116,9 +116,11 @@
 	return 0;
 }
 
-phys_size_t initdram(void)
+int initdram(void)
 {
-	return spd_sdram();
+	gd->ram_size = spd_sdram();
+
+	return 0;
 }
 
 /*