hw/rtc/xlnx-zynqmp-rtc: Remove unused "ptimer.h" include

The "hw/ptimer.h" header is not used, remove it.
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Signed-off-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <20191003230404.19384-14-philmd@redhat.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>

hw/rtc/xlnx-zynqmp-rtc.c

@@ -32,7 +32,6 @@
 #include "qemu/log.h"
 #include "qemu/module.h"
 #include "hw/irq.h"
-#include "hw/ptimer.h"
 #include "qemu/cutils.h"
 #include "sysemu/sysemu.h"
 #include "trace.h"