hardware: make cell instance topology to handle memory pages

Updates VirtNUMATopologyCellInstance to take into account
account pagesize information

Work-Item: Enhance libvirt driver to report available
           large pages per NUMA node in the host state data

Partial-Implement: blueprint virt-driver-large-pages
Change-Id: Ib8772bff16f6ba58a6266a2ef40b9d81b1d7f00a
Merge "hardware: make cell instance topology to handle memory pages"