hw/intc: Fix arm kvm gicv3 selection

While 39a8c3941e may have fixed WHPX, it certainly didn't help KVM:

  $ QTEST_QEMU_BINARY=./qemu-system-aarch64 ./tests/qtest/arm-cpu-features
  ...
  qemu-system-aarch64: unknown type 'kvm-arm-gicv3'

That patch did remove a test for TARGET_AARCH64, which is fine because
it has been a long time since we supported KVM for AArch32.

Cc: qemu-stable@nongnu.org
Fixes: 39a8c3941e ("hw/intc/arm_gicv3: Fix ARM_GICV3 dependency for KVM / WHPX")
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20260812200308.289238-1-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>