powerpc/85xx: specify interrupt for pq3-localbus devices

fsl-lbc driver requires an interrupt to bind to localbus device.
Populate 85xx boards' dts trees with lbc interrupt info.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>