Remove duplicate includes from many files

arch/arm/mach-tegra/timer.c

arch/arm/plat-nomadik/include/plat/ste_dma40.h

arch/tile/kernel/setup.c

arch/x86/mm/init_64.c

arch/x86/xen/enlighten.c

drivers/media/IR/lirc_dev.c

drivers/platform/x86/intel_pmic_gpio.c

include/linux/virtio_9p.h

kernel/trace/trace_kprobe.c