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/ipek01/ipek01.c b/board/ipek01/ipek01.c
index ab94c65..ca99332 100644
--- a/board/ipek01/ipek01.c
+++ b/board/ipek01/ipek01.c
@@ -80,7 +80,7 @@
  *	      CONFIG_SYS_SDRAM_BASE is something else than 0x00000000.
  */
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	struct mpc5xxx_mmap_ctl *mmap_ctl =
 		(struct mpc5xxx_mmap_ctl *)CONFIG_SYS_MBAR;
@@ -135,7 +135,9 @@
 	 */
 	out_be32 (&sdram->sdelay, 0x04);
 
-	return dramsize + dramsize2;
+	gd->ram_size = dramsize + dramsize2;
+
+	return 0;
 }
 
 int checkboard (void)