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/cirrus/edb93xx/edb93xx.c b/board/cirrus/edb93xx/edb93xx.c
index 51ff162..720b490 100644
--- a/board/cirrus/edb93xx/edb93xx.c
+++ b/board/cirrus/edb93xx/edb93xx.c
@@ -216,9 +216,11 @@
 	return dram_total;
 }
 
-void dram_init_banksize(void)
+int dram_init_banksize(void)
 {
 	dram_init_banksize_int(0);
+
+	return 0;
 }
 
 /* called in board_init_f (before relocation) */