irqchip/gic-v3: Add EPPI range support
Expand the pre-existing PPI support to be able to deal with the
Extended PPI range (EPPI). This includes obtaining the number of PPIs
from each individual redistributor, and compute the minimum set
(just in case someone builds something really clever...).
Signed-off-by: NMarc Zyngier <maz@kernel.org>
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