ofpathname: Convert logical device path to OF format for usb devices
ofpathname: Convert logical device path to OF format for usb devices

Add support to convert logical device path to Open firmware
device path for usb devices.

Reported-by: Nikunj A Dadhania <e2f4a5db9b4735182a88051d1e7a3599f9eac9db@linux.vnet.ibm.com>
Signed-off-by: Aruna Balakrishnaiah <ab969200bf8a209ae3a660c857a29117d9771707@linux.vnet.ibm.com>

mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,mdroth/powerpc-utils,kamalesh-babulal/powerpc-utils,leitao/powerpc-ibm-utils-debian,leitao/powerpc-ibm-utils-debian,mdroth/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils,leitao/powerpc-ibm-utils-debian,kamalesh-babulal/powerpc-utils