hw/intc/arm_gicv3_its: Implement MOVALL

hw/intc/arm_gicv3_its: Implement MOVALL

Implement the ITS MOVALL command, which takes all the pending
interrupts on a source redistributor and makes the not-pending on
that source redistributor and pending on a destination redistributor.

This is a GICv3 ITS command which we forgot to implement. (It is
not used by Linux guests.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220122182444.724087-14-peter.maydell@linaro.org