Consolidate firmware-design.md and porting-guide.pm so
that recently added sections fit better with
pre-existing sections. Make the documentation more
consistent in use of terminology.
Change-Id: Id87050b096122fbd845189dc2fe1cd17c3003468
1. Add design information on EL3 runtime services and
Secure-EL1 Payload Dispatchers (SPD) to
firmware-design.md.
2. Create new EL3 runtime service writer's guide
(rt-svc-writers-guide.md) to ease creation of new
runtime services.
Change-Id: I670aeb5fc246e25c6e599a15139aac886a0074fd
Move the firmware design documentation out of user-guide.md
and into a new file - firmware-design.md. Reformat the
section headers.
Change-Id: I664815dd47011c7c1cf2202aa4472a8fd78ebb92
Dan Handley