SELFOUR-607: inline remaining irq path functions

include/arch/x86/arch/model/statedata.h

include/arch/x86/arch/object/iospace.h

include/machine.h

include/machine/hardware.h

include/plat/allwinnerA20/plat/machine/hardware.h

include/plat/am335x/plat/machine/hardware.h

include/plat/am335x/plat/machine/interrupt.h

include/plat/apq8064/plat/machine/hardware.h

include/plat/exynos4/plat/machine/hardware.h

include/plat/exynos5/plat/machine/hardware.h

include/plat/hikey/plat/machine/hardware.h

include/plat/imx31/plat/machine/hardware.h

include/plat/imx31/plat/machine/interrupt.h

include/plat/imx6/plat/machine/hardware.h

include/plat/imx7/plat/machine/hardware.h

include/plat/omap3/plat/machine/hardware.h

include/plat/omap3/plat/machine/interrupt.h

include/plat/pc99/plat/machine/devices.h

include/plat/pc99/plat/machine/hardware.h

include/plat/pc99/plat/machine/interrupt.h