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/m5272c3/m5272c3.c b/board/freescale/m5272c3/m5272c3.c
index 9fab24e..bbe06ba 100644
--- a/board/freescale/m5272c3/m5272c3.c
+++ b/board/freescale/m5272c3/m5272c3.c
@@ -11,6 +11,7 @@
 #include <asm/immap.h>
 #include <asm/io.h>
 
+DECLARE_GLOBAL_DATA_PTR;
 
 int checkboard (void) {
 	puts ("Board: ");
@@ -18,7 +19,7 @@
 	return 0;
 	};
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	sdramctrl_t * sdp = (sdramctrl_t *)(MMAP_SDRAM);
 
@@ -28,7 +29,9 @@
 	/* Dummy write to start SDRAM */
 	*((volatile unsigned long *)0) = 0;
 
-	return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
+	gd->ram_size = CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
+
+	return 0;
 	};
 
 int testdram (void) {