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>

include/common.h

@@ -209,7 +209,7 @@ int	timer_init(void);
 int	cpu_init(void);
 
 /* */
-phys_size_t initdram(void);
+int initdram(void);
 
 #include <display_options.h>