irqdomain cleanups + identity mapping support

Here's the current patch stack I've got against the irqdomain code, which
is about what I need to start being able to reasonably start converting
the SH INTC subsystem over to it.

This whole series is also available via git at:

	git://github.com/pmundt/linux-sh.git common/irqdomain

but I've not yet created a signed tag to pull from as there's likely
still a fair bit of work to do. The diffstat looks innocuous enough, but
is obviously of no real value in this case:

Paul Mundt (8):
      irqdomain: Support removal of IRQ domains.
      irqdomain: Export remaining public API symbols.
      irqdomain: Make irq_domain_simple_map() static.
      irqdomain: Simple NUMA awareness.
      irqdomain: Kill off duplicate definitions.
      irqdomain: Support identity mapped VIRQ allocation.
      irqdomain: trivial pr_fmt conversion.
      irqdomain: Support insertion of existing IRQ allocations.

 include/linux/irqdomain.h |   12 +-
 include/linux/of.h        |   10 +-
 kernel/irq/irqdomain.c    |  187 ++++++++++++++++++++++++++++++++++++++--------
 3 files changed, 168 insertions(+), 41 deletions(-)

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