GICv3 ITS CTLR[Enabled] bit can not be cleared
Description of problem:
ITS CTLR[Enabled] can not be cleared, 

    `s->ctlr |= (value & ~(s->ctlr));`

Link:
https://gitlab.com/qemu-project/qemu/-/blob/master/hw/intc/arm_gicv3_its.c#L899
Steps to reproduce:
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Additional information: