irqchip/gic-v3-its: Add VPE irq domain [de]activation
On activation, a VPE is mapped using the VMAPP command, followed by a VINVALL for a good measure. On deactivation, the VPE is simply unmapped. Reviewed-by: NThomas Gleixner <tglx@linutronix.de> Signed-off-by: NMarc Zyngier <marc.zyngier@arm.com>
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