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/m5373evb/m5373evb.c b/board/freescale/m5373evb/m5373evb.c
index f1ddee1..48a262c 100644
--- a/board/freescale/m5373evb/m5373evb.c
+++ b/board/freescale/m5373evb/m5373evb.c
@@ -22,7 +22,7 @@
 	return 0;
 };
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	sdram_t *sdram = (sdram_t *)(MMAP_SDRAM);
 	u32 dramsize, i;
@@ -62,7 +62,9 @@
 
 	udelay(100);
 
-	return dramsize;
+	gd->ram_size = dramsize;
+
+	return 0;
 };
 
 int testdram(void)