PVH ELF loader: add support for relocatable kernels

Description:

  • Investigate how to support relocatable kernels when loaded directly from Xen (via libelf) for PVH guests.

Context: https://lore.kernel.org/xen-devel/CAOCpoWdOH=xGxiQSC1c5Ueb1THxAjH4WiZbCZq-QT+d_KAk3SA@mail.gmail.com/

Edited by Roger Pau Monné