If we evict enough pages to completely fill the backing store,
through APIs like k_mem_map(), z_page_frame_evict(), or
z_mem_page_out(), this will produce a crash the next time we
try to handle a page fault.
The backing store now always reserves a free storage location
for actual page faults.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
Backing stores and eviction algorithms will be included here.
Exactly one must be chosen, with a default option to leave
the implementation to the application.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
