The following series of patches implement a basic framework
for hypervisor-assisted dump. The very first patch provides 
documentation explaining what this is. 

A list of open issues / todo list is included in the documentation.
It also appears that the not-yet-released firmware versions this was tested 
on are still,incomplete; this work is also pending.

The following is a list of changes from previous version:
- Deleted ifdef CONFIG_PHYP_DUMP from early_init_dt_scan_phyp_dump function.
- Changed reserve_crashed_mem() to phyp_dump_reserve_mem() as suggested.
- Added #ifdef CONFIG_PHYP_DUMP around of_scan_flat_dt call, removed empty function
  from header file.
- Changed phyp_dump_global to phyp_dump_vars.
- Changed style issues at several places.

Manish & Linas.