Update the code of processing device path info in browser to follow UEFI spec.

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14076 6f19259b-4bc3-4df7-8a09-765794883524
Refine the sample about how to convert the device path to string.

Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14077 6f19259b-4bc3-4df7-8a09-765794883524