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/sbc8641d/sbc8641d.c b/board/sbc8641d/sbc8641d.c
index a541d25..44842d5 100644
--- a/board/sbc8641d/sbc8641d.c
+++ b/board/sbc8641d/sbc8641d.c
@@ -23,6 +23,8 @@
 #include <libfdt.h>
 #include <fdt_support.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 long int fixed_sdram (void);
 
 int board_early_init_f (void)
@@ -37,7 +39,7 @@
 	return 0;
 }
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	long dram_size = 0;
 
@@ -48,7 +50,9 @@
 #endif
 
 	debug ("    DDR: ");
-	return dram_size;
+	gd->ram_size = dram_size;
+
+	return 0;
 }
 
 #if defined(CONFIG_SYS_DRAM_TEST)