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/m5282evb/m5282evb.c b/board/freescale/m5282evb/m5282evb.c
index 19e5695..7f3c04c 100644
--- a/board/freescale/m5282evb/m5282evb.c
+++ b/board/freescale/m5282evb/m5282evb.c
@@ -16,7 +16,7 @@
 	return 0;
 }
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	u32 dramsize, i, dramclk;
 
@@ -80,5 +80,7 @@
 		/* Write to the SDRAM Mode Register */
 		*(u32 *)(CONFIG_SYS_SDRAM_BASE + 0x400) = 0xA5A59696;
 	}
-	return dramsize;
+	gd->ram_size = dramsize;
+
+	return 0;
 }