meson: 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>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

arch/arm/mach-meson/board-info.c

@@ -168,7 +168,7 @@ static unsigned int get_socinfo(void)
 	return socinfo;
 }
 
-int show_board_info(void)
+int checkboard(void)
 {
 	unsigned int socinfo;