nodedev: conf: Split PCI sub-capability parsing to separate methods
nodedev: conf: Split PCI sub-capability parsing to separate methods

Since there's at least SRIOV and MDEV sub-capabilities to be parsed,
let's make the code more readable by splitting it to several logical
blocks.

Signed-off-by: Erik Skultety <2c14d38fa47c8799f1b9c16280abe27f8edfec6e@redhat.com>

fabianfreyer/libvirt,zippy2/libvirt,datto/libvirt,jardasgit/libvirt,nertpinx/libvirt,jardasgit/libvirt,datto/libvirt,zippy2/libvirt,nertpinx/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,datto/libvirt,zippy2/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,eskultety/libvirt,eskultety/libvirt,olafhering/libvirt,libvirt/libvirt,nertpinx/libvirt,jfehlig/libvirt,jardasgit/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,datto/libvirt,jfehlig/libvirt,datto/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,libvirt/libvirt,libvirt/libvirt,fabianfreyer/libvirt,olafhering/libvirt,andreabolognani/libvirt,nertpinx/libvirt,andreabolognani/libvirt,jardasgit/libvirt,crobinso/libvirt,zippy2/libvirt,crobinso/libvirt,VenkatDatta/libvirt,crobinso/libvirt,jfehlig/libvirt,olafhering/libvirt,eskultety/libvirt,crobinso/libvirt,fabianfreyer/libvirt,olafhering/libvirt,VenkatDatta/libvirt,libvirt/libvirt,eskultety/libvirt,fabianfreyer/libvirt