clk: tegra: add clock support for Tegra30

Add Tegra30 clock support based on common clock framework.

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
[swarren: ensure all OF lookups return valid cookies i.e. an explicit
error pointer or valid pointer not NULL, adapt to renames in earlier
patches, fixed some checkpatch issues.]
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

drivers/clk/tegra/Makefile

@@ -8,3 +8,4 @@ obj-y					+= clk-pll-out.o
 obj-y					+= clk-super.o
 
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += clk-tegra20.o
+obj-$(CONFIG_ARCH_TEGRA_3x_SOC)         += clk-tegra30.o

drivers/clk/tegra/clk.h

@@ -493,4 +493,10 @@ void tegra20_clock_init(struct device_node *np);
 static inline void tegra20_clock_init(struct device_node *np) {}
 #endif /* CONFIG_ARCH_TEGRA_2x_SOC */
 
+#ifdef CONFIG_ARCH_TEGRA_3x_SOC
+void tegra30_clock_init(struct device_node *np);
+#else
+static inline void tegra30_clock_init(struct device_node *np) {}
+#endif /* CONFIG_ARCH_TEGRA_3x_SOC */
+
 #endif /* TEGRA_CLK_H */