MdeModulePkg: Add GraphicsOutputDxe driver.

MdeModulePkg: Add GraphicsOutputDxe driver.

The driver uses the GraphicsInfo HOB and GraphicsDeviceInfo HOB
passed from PEI to find the graphics controller to manage and
produce the GraphicsOutput protocol.

GraphicsInfo HOB and GraphicsDeviceInfo HOB are created by
a PEIM which initializes the graphics controller hardware in
PEI phase.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>