HarmonyOS mtu设置之后执行发现服务方法返回服务列表为空，不设置mtu执行发现服务方法返回列表正常

示例代码：

gattClientDevice.setBLEMtuSize(MkdPrinterParams.self.printerConfigParams.printerBluetoothBleMTU);
gattClientDevice.on('BLEMtuChange', (mtu: number) => {
  console.info('BLEMtuChange, mtu: ' + mtu);
  MkdPrinterConfigurations.defaultConnectConfig.sendDataPackageSize = Math.floor(MkdPrinterParams.self.printerConfigParams.printerBluetoothBleMTU);
  gattClientDevice.off('BLEMtuChange');
});
gattClientDevice.getServices().then(gattServices => {
  console.info("getServices successfully:" + JSON.stringify(gattServices));
});
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