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/arch/arm/mach-omap2/omap3/emif4.c b/arch/arm/mach-omap2/omap3/emif4.c
index a2aadc9..d540cf0 100644
--- a/arch/arm/mach-omap2/omap3/emif4.c
+++ b/arch/arm/mach-omap2/omap3/emif4.c
@@ -142,7 +142,7 @@
 	return 0;
 }
 
-void dram_init_banksize (void)
+int dram_init_banksize(void)
 {
 	unsigned int size0 = 0, size1 = 0;
 
@@ -153,6 +153,8 @@
 	gd->bd->bi_dram[0].size = size0;
 	gd->bd->bi_dram[1].start = PHYS_SDRAM_1 + get_sdr_cs_offset(CS1);
 	gd->bd->bi_dram[1].size = size1;
+
+	return 0;
 }
 
 /*