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/ddr.c b/board/freescale/t208xrdb/ddr.c
index 3487261..bcb536a 100644
--- a/board/freescale/t208xrdb/ddr.c
+++ b/board/freescale/t208xrdb/ddr.c
@@ -97,7 +97,7 @@
 	popts->cpo_sample = 0x54;
 }
 
-phys_size_t initdram(int board_type)
+phys_size_t initdram(void)
 {
 	phys_size_t dram_size;
 
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();