Add support for scaling layers.

Add support for scaling layers.

External display might have a difference resolution compared to
primary and when in clone mode we would need to scale layers to
match the resolution. For now this results in gpu composition of
all layers but in future we could use pipe scalar to scale the
layers.

Jira: IAHWC-80
Test: Linux test apps scale layers automatically when external
      display and primary display resolutions don't match.

Signed-off-by: Kalyan Kondapally <kalyan.kondapally@intel.com>