h/q/d: Add utility function for 8x16 and read RGB scalar capability

 - Add utility function for 8x16
 - Add internal function to identify if RGB doesn't
   support scaling that is read from capabilities node.
 - If UI layer needs scaling and RGB pipe doesn't
   support scalar, request a VG pipe
 - On 8x16, request DMA pipe for WFD

Change-Id: I94e8e0371bb10fcad53fddd2b7c45bc9b2594a4d
5 files changed