hw/intc/arm_gicv3: Include missing 'qemu/error-report.h' header

kvm_arm_its_reset_hold() calls warn_report(), itself declared
in "qemu/error-report.h".

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Message-id: 20231123183518.64569-2-philmd@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/intc/arm_gicv3_its_kvm.c

@@ -21,6 +21,7 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "qemu/module.h"
+#include "qemu/error-report.h"
 #include "hw/intc/arm_gicv3_its_common.h"
 #include "hw/qdev-properties.h"
 #include "sysemu/runstate.h"