timepicker can't change nzDisabledHours attribute dynamically

[mraiguo]

I'm submitting a...

[ ] Bug report  
## Current code


《nz-timepicker 
      [nzDisabledHours]="disableHours"
      formControlName="start_time" 
       [nzFormat]="'HH:mm'">
《button (click)="changeDisableHours()">确定


// 开始时默认的不能点击的小时时间
  disableHours = () => {
    return this.newArray(1,10);
  };
// 点击按钮后，改变的小时时间
  changeDisableHours() {
    this.disableHours = () => {
      return this.newArray(1,20);
    }
  }
## Expected behavior

当我点击button的时候，通过changeDisableHours方法我改变了disableHours输出的array，
这时我希望time-picker里面的disableHours也随之改变





## Environment


Angular version: 4.3.2

ng-zorro-antd version: ^0.5.0-rc.4

Browser:
- [ ] Chrome (desktop) version XX


For Tooling issues:
- Node version: v8.4.0 
- Platform:  mac

[wilsoncook]

AFAIK, the disabled status only initialized at nz-timepicker's ngOnInit life cycle, that's to say, the ui will not re-rendered while settled once.

[lock]

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