board_f: Drop board_type parameter from initdram()

It looks like only cm5200 and tqm8xx use this feature, so we don't really
need it in generic code. Drop it and have the users access gd->board_type
directly.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/freescale/t208xrdb/spl.c b/board/freescale/t208xrdb/spl.c
index aa8e928..44be70b 100644
--- a/board/freescale/t208xrdb/spl.c
+++ b/board/freescale/t208xrdb/spl.c
@@ -98,7 +98,7 @@
 
 	i2c_init_all();
 
-	gd->ram_size = initdram(0);
+	gd->ram_size = initdram();
 
 #ifdef CONFIG_SPL_MMC_BOOT
 	mmc_boot();