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/AndesTech/adp-ag101p/adp-ag101p.c b/board/AndesTech/adp-ag101p/adp-ag101p.c
index 84c77f7..805a266 100644
--- a/board/AndesTech/adp-ag101p/adp-ag101p.c
+++ b/board/AndesTech/adp-ag101p/adp-ag101p.c
@@ -49,12 +49,14 @@
 	return 0;
 }
 
-void dram_init_banksize(void)
+int dram_init_banksize(void)
 {
 	gd->bd->bi_dram[0].start = PHYS_SDRAM_0;
 	gd->bd->bi_dram[0].size =  PHYS_SDRAM_0_SIZE;
 	gd->bd->bi_dram[1].start = PHYS_SDRAM_1;
 	gd->bd->bi_dram[1].size =  PHYS_SDRAM_1_SIZE;
+
+	return 0;
 }
 
 int board_eth_init(bd_t *bd)