ARM: tegra: simplify GPU setup

Enable the GPU node in the system-wide ft_system_setup() hook instead of
the board-specific ft_board_hook(). This allows us to enable GPU per SoC
generation instead of per-board as we did initially.

Reported-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/tegra-common.h b/include/configs/tegra-common.h
index a005e6a..32cc39b 100644
--- a/include/configs/tegra-common.h
+++ b/include/configs/tegra-common.h
@@ -143,4 +143,6 @@
 #define CONFIG_FAT_WRITE
 #endif
 
+#define CONFIG_OF_SYSTEM_SETUP
+
 #endif /* _TEGRA_COMMON_H_ */