-The kernel has a debug feature which poisons the memory of all pages
with a known value 0xaa. When the poison bit is set, all memory should
be this known value, else some kind of corruption has occurred.
-Added a parser to walk all the pages and verify that all poisoned
pages have the poisoned value.
Change-Id: I9d73fbdd7e5e4ee92a6043773822d5ec9cdd8681