hw/ppc/sam460ex: Correctly set MAL properties

hw/ppc/sam460ex: Correctly set MAL properties

MAL properties are declared as uint8_t:

  static Property ppc4xx_mal_properties[] = {
      DEFINE_PROP_UINT8("txc-num", Ppc4xxMalState, txcnum, 0),
      DEFINE_PROP_UINT8("rxc-num", Ppc4xxMalState, rxcnum, 0),
      DEFINE_PROP_END_OF_LIST(),
  };

Correct the API use by setting the property using
qdev_prop_set_uint8(). No behavioral change.

Fixes: da116a8aab ("ppc/ppc405: QOM'ify MAL")
Reviewed-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230203145536.17585-7-philmd@linaro.org>