ramdisk: enable ppc64 support for symlink
ramdisk: enable ppc64 support for symlink

Patch enables symlink /usr/lib -> ../lib  support for ppc64 Fedora deployment ramdisk.

Change-Id: I01994685292d7c1cae0f9ec1a1052d68420b4b82
Closes-Bug: #1463357

takahashinobuyuki/diskimage-builder,switch-ch/diskimage-builder,zioproto/diskimage-builder,takahashinobuyuki/diskimage-builder,openstack/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,CSC-IT-Center-for-Science/diskimage-builder,zioproto/diskimage-builder,switch-ch/diskimage-builder,openstack/diskimage-builder