arm: mvebu: turris_omnia: Use show_board_info()

We are printing board information in checkboard() function, which is
called from the default weak implementation of show_board_info().

Rename checkboard() to show_board_info(). This throws away the weak
implementation of show_board_info().

Signed-off-by: Marek BehĂșn <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index 7a86111..39051a8 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -468,7 +468,7 @@
 	return dev;
 }
 
-int checkboard(void)
+int show_board_info(void)
 {
 	u32 version_num, serial_num;
 	int err = 1;
@@ -496,7 +496,7 @@
 	}
 
 out:
-	printf("Turris Omnia:\n");
+	printf("Model: Turris Omnia\n");
 	printf("  RAM size: %i MiB\n", omnia_get_ram_size_gb() * 1024);
 	if (err)
 		printf("  Serial Number: unknown\n");