sh: intc: optimize intc IRQ lookup

This ensures that the sense/prio lists are sorted at registration time,
enabling us to use a simple binary search for an optimized lookup
(something that had been on the TODO for some time).

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

diff --cc drivers/sh/intc/chip.c
Simple merge

diff --cc drivers/sh/intc/core.c
Simple merge

diff --cc drivers/sh/intc/internals.h
Simple merge