Add new Display API for secure video capabilities.

Added a new API to determine whether the display supports
protected buffers so that an application can choose a different
content stream or change how it decodes the content so
that it will be viewable on the display.

At present, wifi display does not fully support protected
buffers although this may be enhanced in the future.

Bug: 6986623
Change-Id: If53a53d72b0ec92753cc4b29f99fcb131e00449b