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/a3m071/a3m071.c b/board/a3m071/a3m071.c
index 55d0bc8..b11ff98 100644
--- a/board/a3m071/a3m071.c
+++ b/board/a3m071/a3m071.c
@@ -76,7 +76,7 @@
  * use of CONFIG_SYS_SDRAM_BASE. The code does not work if
  * CONFIG_SYS_SDRAM_BASE is something else than 0x00000000.
  */
-phys_size_t initdram(int board_type)
+phys_size_t initdram(void)
 {
 	ulong dramsize = 0;
 	ulong dramsize2 = 0;