hw/intc/arm_gicv3_cpuif: Don't downgrade monitor traps for AArch32 EL3

hw/intc/arm_gicv3_cpuif: Don't downgrade monitor traps for AArch32 EL3

In the gicv3_{irq,fiq,irqfiq}_access() functions, there is a check
which downgrades a CP_ACCESS_TRAP_EL3 to CP_ACCESS_TRAP if EL3 is not
AArch64.  This has been there since the GIC was first implemented,
but it isn't right: if we are trapping because of SCR.IRQ or SCR.FIQ
then we definitely want to be going to EL3 (doing
AArch32.TakeMonitorTrapException() in pseudocode terms).  We might
want to not take a trap at all, but we don't ever want to go to the
default target EL, because that would mean, for instance, taking a
trap to Hyp mode if the trapped access was made from Hyp mode.

(This might have been an attempt to work around our failure to
properly implement Monitor Traps.)

Remove the bogus check.

Cc: qemu-stable@nongnu.org
Fixes: 359fbe65e01e ("hw/intc/arm_gicv3: Implement GICv3 CPU interface registers")
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250130182309.717346-7-peter.maydell@linaro.org
(cherry picked from commit d04c6c3c000ab3e588a2b91641310aeea89408f7)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>