Add debug message to output video resolution used by GraphicsConsole.

Signed-off-by: Li Elvin <elvin.li@intel.com>
Reviewed-by: Ni Ruiyu <ruiyu.ni@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14210 6f19259b-4bc3-4df7-8a09-765794883524