Update all the code to consume the ConvertDevicePathToText, ConvertDevicePathNodeToText, ConvertTextToDevicePath and ConvertTextToDeviceNode APIs in DevicePathLib.

Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
Reviewed-by: Elvin Li <elvin.li@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>
Reviewed-by: Guo Dong <guo.dong@intel.com>

git-svn-id: svn://svn.code.sf.net/p/edk2/code/trunk/edk2/OvmfPkg@14505 6f19259b-4bc3-4df7-8a09-765794883524