CdkDropList autoScrollDisabled should use coerceBooleanProperty

[skrtheboss]

Reproduction

Steps to reproduce:

1. add cdkDropListAutoScrollDisabled attribute to cdkDropList
2. autoScroll is not disabled

Expected Behavior

AutoScroll should be disabled by adding cdkDropListAutoScrollDisabled without setting it to true explicitely.

Actual Behavior

With the acual behaviour you need to write [cdkDropListAutoScrollDisabled]="true"

Environment

• Angular: 8.2.11
• CDK/Material: 8.2.3
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Widnows

[skrtheboss]

coearceBooleanProperty should be added here:

https://github.com/angular/components/blob/master/src/cdk/drag-drop/directives/drop-list.ts#L124

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