irqchip/gic-v3: Add GICv4.1 VPEID size discovery
While GICv4.0 mandates 16 bit worth of VPEIDs, GICv4.1 allows smaller implementations to be built. Add the required glue to dynamically compute the limit. Signed-off-by:Marc Zyngier <maz@kernel.org> Reviewed-by:
Zenghui Yu <yuzenghui@huawei.com> Link: https://lore.kernel.org/r/20191224111055.11836-3-maz@kernel.org
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b25319d2
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