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
diff --git a/config/profile/profile_medium.cmake b/config/profile/profile_medium.cmake
index 99687cc..26b1233 100644
--- a/config/profile/profile_medium.cmake
+++ b/config/profile/profile_medium.cmake
@@ -20,3 +20,5 @@
 
 set(TFM_MBEDCRYPTO_CONFIG_PATH              "${CMAKE_SOURCE_DIR}/lib/ext/mbedcrypto/mbedcrypto_config/tfm_mbedcrypto_config_profile_medium.h" CACHE PATH "Config to use for Mbed Crypto")
 set(TFM_MBEDCRYPTO_PSA_CRYPTO_CONFIG_PATH   "${CMAKE_SOURCE_DIR}/lib/ext/mbedcrypto/mbedcrypto_config/crypto_config_profile_medium.h" CACHE PATH "Config to use psa crypto setting for Mbed Crypto.")
+
+set(CONFIG_TFM_SPM_BACKEND          "IPC"       CACHE STRING    "The SPM backend [IPC, SFN]")