target/arm/helper: Implement CNTHCTL_EL2.CNT[VP]MASK

target/arm/helper: Implement CNTHCTL_EL2.CNT[VP]MASK

When FEAT_RME is implemented, these bits override the value of
CNT[VP]_CTL_EL0.IMASK in Realm and Root state. Move the IRQ state update
into a new gt_update_irq() function and test those bits every time we
recompute the IRQ state.

Since we're removing the IRQ state from some trace events, add a new
trace event for gt_update_irq().

Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Message-id: 20230809123706.1842548-7-jean-philippe@linaro.org
[PMM: only register change hook if not USER_ONLY and if TCG]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>