tegra: Move checkboard() into the board code

This is only used by Nvidia boards, so move it into nvidia/common to
simplify things.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index 018dddb..f1a9496 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -53,10 +53,6 @@
 };
 #endif
 
-const struct tegra_sysinfo sysinfo = {
-	CONFIG_TEGRA_BOARD_STRING
-};
-
 __weak void pinmux_init(void) {}
 __weak void pin_mux_usb(void) {}
 __weak void pin_mux_spi(void) {}
@@ -85,6 +81,15 @@
 #endif
 }
 
+#ifdef CONFIG_DISPLAY_BOARDINFO
+int checkboard(void)
+{
+	printf("Board: %s\n", CONFIG_TEGRA_BOARD_STRING);
+
+	return 0;
+}
+#endif	/* CONFIG_DISPLAY_BOARDINFO */
+
 /*
  * Routine: board_init
  * Description: Early hardware init.