Kconfig: Refine SPM Kconfig configs

This patch mainly refines these points:

 - Add more SPM configs from config_base.cmake
 - Refine option name and help
 - Fix IPC/SFN backend option prefix

Signed-off-by: Jianliang Shen <jianliang.shen@arm.com>
Change-Id: I7eb362beeb266112086ed224aa8de7bff8f75467
3 files changed