udoo: Use checkboard() instead of show_board_info()

Boards can use a sysinfo driver if a particular model name is needed.
Update this board to use checkboard() directly, rather than having a
weak function laid on top of a weak function.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/udoo/neo/neo.c b/board/udoo/neo/neo.c
index 730e266..d99d93b 100644
--- a/board/udoo/neo/neo.c
+++ b/board/udoo/neo/neo.c
@@ -212,7 +212,7 @@
 }
 
 /* Override the default implementation, DT model is not accurate */
-int show_board_info(void)
+int checkboard(void)
 {
 	int *board_type = (int *)OCRAM_START;