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/mpc8610hpcd/mpc8610hpcd.c b/board/freescale/mpc8610hpcd/mpc8610hpcd.c
index 7668226..0422208 100644
--- a/board/freescale/mpc8610hpcd/mpc8610hpcd.c
+++ b/board/freescale/mpc8610hpcd/mpc8610hpcd.c
@@ -19,6 +19,8 @@
 #include <spd_sdram.h>
 #include <netdev.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 void sdram_init(void);
 phys_size_t fixed_sdram(void);
 int mpc8610hpcd_diu_init(void);
@@ -116,7 +118,7 @@
 }
 
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	phys_size_t dram_size = 0;
 
@@ -129,7 +131,9 @@
 	setup_ddr_bat(dram_size);
 
 	debug(" DDR: ");
-	return dram_size;
+	gd->ram_size = dram_size;
+
+	return 0;
 }