linux-phytec-fsl

sh: intc: Allocate subgroup virq backing desc directly.

This switches to using irq_alloc_desc() directly for subgroup IRQs.
We still need to call activate_irq() on these in order to make them
requestable, at least up until these get moved in to their own irq
domain..

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