arm/tegra: Delete tegra_init_clock()

tegra_init_clock() is written to call tegra2_init_clocks(), which only
exists if Tegra20 support is enabled. This breaks the build of a
Tegra30-only kernel.

tegra_init_clock() isn't actually used any more; tegra20_init_early()
calls tegra2_init_clocks() directly. So, just delete this function.
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/mach-tegra/board.h

@@ -30,7 +30,6 @@ void __init tegra30_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);
 
 extern struct sys_timer tegra_timer;

arch/arm/mach-tegra/clock.c

@@ -399,11 +399,6 @@ void tegra_periph_reset_assert(struct clk *c)
 }
 EXPORT_SYMBOL(tegra_periph_reset_assert);
 
-void __init tegra_init_clock(void)
-{
-	tegra2_init_clocks();
-}
-
 #ifdef CONFIG_DEBUG_FS
 
 static int __clk_lock_all_spinlocks(void)