irqchip/mips-gic: Populate irq_domain names

Set the irq_domain names so that they don't default to an unhelpful
value.

Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com>
Reviewed-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Qais Yousef <qsyousef@gmail.com>
Cc: jason@lakedaemon.net
Cc: marc.zyngier@arm.com
Link: http://lkml.kernel.org/r/1464001657-31348-1-git-send-email-harvey.hunt@imgtec.com


Signed-off-by: Thomas Gleixner <tglx@linutronix.de>