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/m5235evb/m5235evb.c b/board/freescale/m5235evb/m5235evb.c
index 7aa0edf..1d82e93 100644
--- a/board/freescale/m5235evb/m5235evb.c
+++ b/board/freescale/m5235evb/m5235evb.c
@@ -22,7 +22,7 @@
 	return 0;
 };
 
-phys_size_t initdram(void)
+int initdram(void)
 {
 	sdram_t *sdram = (sdram_t *)(MMAP_SDRAM);
 	gpio_t *gpio = (gpio_t *)(MMAP_GPIO);
@@ -97,7 +97,9 @@
 		*(u32 *) (CONFIG_SYS_SDRAM_BASE + 0x400) = 0xA5A59696;
 	}
 
-	return dramsize;
+	gd->ram_size = dramsize;
+
+	return 0;
 };
 
 int testdram(void)