Provide a dummy value of NO_IRQ for architectures that don't support
it (such as MIPS).  Fixes the build error for MIPS.
Signed-off-by: NWanlong Gao <wanlong.gao@gmail.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Signed-off-by: NChris Ball <cjb@laptop.org>