board_f: Drop setup_dram_config() wrapper

By making dram_init_banksize() return an error code we can drop the
wrapper. Adjust this and clean up all implementations.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/armadeus/apf27/apf27.c b/board/armadeus/apf27/apf27.c
index 16adf6e..1abfe88 100644
--- a/board/armadeus/apf27/apf27.c
+++ b/board/armadeus/apf27/apf27.c
@@ -193,7 +193,7 @@
 	return 0;
 }
 
-void dram_init_banksize(void)
+int dram_init_banksize(void)
 {
 	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
 	gd->bd->bi_dram[0].size  = get_ram_size((void *)PHYS_SDRAM_1,
@@ -204,6 +204,8 @@
 					     PHYS_SDRAM_2_SIZE);
 	else
 		gd->bd->bi_dram[1].size = 0;
+
+	return 0;
 }
 
 ulong board_get_usable_ram_top(ulong total_size)