arm/tegra: prepare early init for multiple tegra variants

This patch splits the early init code in a common and a tegra20 specific part.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Colin Cross <ccross@android.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/mach-tegra/board.h b/arch/arm/mach-tegra/board.h
index 1d14df7..fdec3ff 100644
--- a/arch/arm/mach-tegra/board.h
+++ b/arch/arm/mach-tegra/board.h
@@ -25,9 +25,10 @@
 
 void tegra_assert_system_reset(char mode, const char *cmd);
 
-void __init tegra_init_early(void);
+void __init tegra20_init_early(void);
 void __init tegra_map_common_io(void);
 void __init tegra_init_irq(void);
+void __init tegra_dt_init_irq(void);
 void __init tegra_init_clock(void);
 int __init tegra_pcie_init(bool init_port0, bool init_port1);