When running device-introspect-test, a memory leak occurred in the
exynos4210_pwm_init function, so use ptimer_free() in the finalize function to
avoid it.

ASAN shows memory leak stack:

Indirect leak of 240 byte(s) in 5 object(s) allocated from:
    #0 0xffffab97e1f0 in __interceptor_calloc (/lib64/libasan.so.5+0xee1f0)
    #1 0xffffab256800 in g_malloc0 (/lib64/libglib-2.0.so.0+0x56800)
    #2 0xaaabf555db84 in timer_new_full /qemu/include/qemu/timer.h:523
    #3 0xaaabf555db84 in timer_new /qemu/include/qemu/timer.h:544
    #4 0xaaabf555db84 in timer_new_ns /qemu/include/qemu/timer.h:562
    #5 0xaaabf555db84 in ptimer_init /qemu/hw/core/ptimer.c:433
    #6 0xaaabf56a36cc in exynos4210_pwm_init /qemu/hw/timer/exynos4210_pwm.c:401
    #7 0xaaabf6339f6c in object_initialize_with_type /qemu/qom/object.c:515
    #8 0xaaabf633a1e0 in object_new_with_type /qemu/qom/object.c:729
    #9 0xaaabf6375e40 in qmp_device_list_properties /qemu/qom/qom-qmp-cmds.c:153
    #10 0xaaabf653d8ec in qmp_marshal_device_list_properties /qemu/qapi/qapi-commands-qdev.c:59
    #11 0xaaabf6587d08 in do_qmp_dispatch_bh /qemu/qapi/qmp-dispatch.c:110
    #12 0xaaabf6552708 in aio_bh_call /qemu/util/async.c:136

Reported-by: Euler Robot <euler.robot@huawei.com>
Signed-off-by: Gan Qixin <ganqixin@huawei.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>