Mini-OS: Add more symbols to global namespace

Adding minios_ioremap, minios_ioremap_nocache, minios_iounmap,
minios_alloc_contig_pages. Required by rumphyper_pci.

Signed-off-by: Martin Lucina <martin@lucina.net>
Mini-OS: Link entire arch-specific lib into minios.o

The arch-specific lib contains code which external callers depend on;
ensure the whole archive is linked into minios.o.

Signed-off-by: Martin Lucina <martin@lucina.net>
Re-enable rumphyper_pci and PCI passthrough libs.

Fixed by adding relevant symbols to minios global namespace. Compile
tested only.

Signed-off-by: Martin Lucina <martin@lucina.net>