tegra: Allow board-specific init

Add a hook to allows boards to add their own init to board_init().

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c
index 131802a..ebcee4e 100644
--- a/arch/arm/mach-tegra/board2.c
+++ b/arch/arm/mach-tegra/board2.c
@@ -107,6 +107,11 @@
 	return 0;
 }
 
+__weak int nvidia_board_init(void)
+{
+	return 0;
+}
+
 /*
  * Routine: board_init
  * Description: Early hardware init.
@@ -180,8 +185,7 @@
 	/* prepare the WB code to LP0 location */
 	warmboot_prepare_code(TEGRA_LP0_ADDR, TEGRA_LP0_SIZE);
 #endif
-
-	return 0;
+	return nvidia_board_init();
 }
 
 #ifdef CONFIG_BOARD_EARLY_INIT_F