display: Add metadata types for allocated width and height

The standard metadata types for width and height return the
values requested by the client, rather than the width and height
of the allocated buffer. This change adds internal metadata types
so clients can query the allocated values.

CRs-Fixed: 2638621
Change-Id: I7c69cff65512c30e27eb86ef33f67079c979eeb6
3 files changed