mat-select aria-label

[kekraft]

Bug:
mat-select should have the aria-label of the placeholder or mat-select-trigger read by default. Currently, with Chrome Vox the default behavior is to get the role 'listbox' read.

Expected behavior:
By default, mat-select should have the aria-label of the mat-select or mat-select-trigger contents read.

Current behavior:
mat-select has 'listbox' role shadowing the aria-label.

To reproduce:

Go to: https://material.angular.io/components/select/examples
Enable Chrome Vox.
Tab to the 'Favorite food' dropdown and get 'listbox' by the reader.

[josephperrott]

Closing as duplicate of #5220

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