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/a3m071/a3m071.c b/board/a3m071/a3m071.c
index b11ff98..c1120c4 100644
--- a/board/a3m071/a3m071.c
+++ b/board/a3m071/a3m071.c
@@ -76,7 +76,7 @@
  * use of CONFIG_SYS_SDRAM_BASE. The code does not work if
  * CONFIG_SYS_SDRAM_BASE is something else than 0x00000000.
  */
-phys_size_t initdram(void)
+int initdram(void)
 {
 	ulong dramsize = 0;
 	ulong dramsize2 = 0;
@@ -153,7 +153,9 @@
 	if ((SVR_MJREV(svr) >= 2) && (PVR_MAJ(pvr) == 1) && (PVR_MIN(pvr) == 4))
 		out_be32((void *)MPC5XXX_SDRAM_SDELAY, 0x04);
 
-	return dramsize + dramsize2;
+	gd->ram_size = dramsize + dramsize2;
+
+	return 0;
 }
 
 static void get_revisions(int *failsavelevel, int *digiboardversion,