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/mpc8308_p1m/sdram.c b/board/mpc8308_p1m/sdram.c
index 96d60c9..e0f4671 100644
--- a/board/mpc8308_p1m/sdram.c
+++ b/board/mpc8308_p1m/sdram.c
@@ -61,7 +61,7 @@
 	return get_ram_size(CONFIG_SYS_DDR_SDRAM_BASE, msize);
 }
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
 	u32 msize;
@@ -72,6 +72,8 @@
 	/* DDR SDRAM */
 	msize = fixed_sdram();
 
-	/* return total bus SDRAM size(bytes)  -- DDR */
-	return msize;
+	/* set total bus SDRAM size(bytes)  -- DDR */
+	gd->ram_size = msize;
+
+	return 0;
 }