mini-os: fix number of pages for PVH

mini-os: fix number of pages for PVH

When getting the current allocation from Xen, this value includes the
pages allocated in the MMIO area. Fix the highest available RAM page
by subtracting the size of that area.

This requires to read the E820 map before needing this value. Add two
functions returning the current and the maximum number of RAM pages
taking this correction into account.

At the same time add the LAPIC page to the memory map in order to
avoid reusing that PFN for internal purposes.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>