ARM: EXYNOS: cleanup <mach/regs-irq.h>

Remove useless inclusion <mach/regs-irq.h> for exynos.

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/plat-samsung/pm.c

@@ -29,7 +29,9 @@
 #include <mach/hardware.h>
 #include <mach/map.h>
 #include <mach/regs-clock.h>
+#ifndef CONFIG_ARCH_EXYNOS
 #include <mach/regs-irq.h>
+#endif
 #include <mach/irqs.h>
 #endif