ARM: tegra: irq: Move legacy_irq.c into irq.c

Now that irq.c is just an interface layer between the gic
and legacy_irq.c, move the contents of legacy_irq.c into
irq.c.

Signed-off-by: Colin Cross <ccross@android.com>
diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 1afe050..823c703 100644
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -1,7 +1,7 @@
 obj-y                                   += common.o
 obj-y                                   += devices.o
 obj-y                                   += io.o
-obj-y                                   += irq.o legacy_irq.o
+obj-y                                   += irq.o
 obj-y                                   += clock.o
 obj-y                                   += timer.o
 obj-y                                   += gpio.o