Update Yoichi Yuasa's e-mail address

arch/mips/cobalt/buttons.c

arch/mips/cobalt/lcd.c

arch/mips/cobalt/led.c

arch/mips/cobalt/mtd.c

arch/mips/cobalt/rtc.c

arch/mips/cobalt/serial.c

arch/mips/cobalt/time.c

arch/mips/gt64120/wrppmc/serial.c

arch/mips/include/asm/ds1287.h

arch/mips/include/asm/irq_gt641xx.h

arch/mips/include/asm/mach-cobalt/irq.h

arch/mips/include/asm/mach-cobalt/mach-gt64120.h

arch/mips/include/asm/vr41xx/capcella.h

arch/mips/include/asm/vr41xx/giu.h

arch/mips/include/asm/vr41xx/irq.h

arch/mips/include/asm/vr41xx/mpc30x.h

arch/mips/include/asm/vr41xx/pci.h

arch/mips/include/asm/vr41xx/siu.h

arch/mips/include/asm/vr41xx/tb0219.h

arch/mips/include/asm/vr41xx/tb0226.h