generic-board: show model name in board_init_f() too

The common/board_r.c has show_model_r() to display the model name
if the DTB has a "model" property.  It sounds useful to have a similar
function in common/board_f.c too because most of the boards show
their board name before relocation.

Instead of implementing the same function in both common/board_f.c
and common/board_r.c, let's split it up into common/show_board_info.c.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/common/board_f.c b/common/board_f.c
index 215108b..7953137 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -894,7 +894,7 @@
 	prt_mpc5xxx_clks,
 #endif /* CONFIG_MPC5xxx */
 #if defined(CONFIG_DISPLAY_BOARDINFO)
-	checkboard,		/* display board info */
+	show_board_info,
 #endif
 	INIT_FUNC_WATCHDOG_INIT
 #if defined(CONFIG_MISC_INIT_F)