alpha: Convert to new irq function names

arch/alpha/kernel/irq.c

arch/alpha/kernel/irq_alpha.c

arch/alpha/kernel/irq_i8259.c

arch/alpha/kernel/irq_pyxis.c

arch/alpha/kernel/irq_srm.c

arch/alpha/kernel/sys_alcor.c

arch/alpha/kernel/sys_cabriolet.c

arch/alpha/kernel/sys_dp264.c

arch/alpha/kernel/sys_eb64p.c

arch/alpha/kernel/sys_eiger.c

arch/alpha/kernel/sys_jensen.c

arch/alpha/kernel/sys_marvel.c

arch/alpha/kernel/sys_mikasa.c

arch/alpha/kernel/sys_noritake.c

arch/alpha/kernel/sys_rawhide.c

arch/alpha/kernel/sys_rx164.c

arch/alpha/kernel/sys_sable.c

arch/alpha/kernel/sys_takara.c

arch/alpha/kernel/sys_titan.c

arch/alpha/kernel/sys_wildfire.c