Build: Change config_default to build minimum.

- disable all partitions
- default SPM backend is SFN
= set log level to silent
- adjust platform's CMake scripts
  - to include acceleartor conditionally
  - enable partitions required for some platform

Signed-off-by: Anton Komlev <anton.komlev@arm.com>
Change-Id: Icc36078c396e3a94a91fdf93d7f1bd5a46dc0d69
13 files changed