Build: Correct usage of out-of-tree test suite build

Extra test suite build currently doesn't support to build
multiple test suites from different directories. The cmake
configuration names and build system are updated.

Signed-off-by: Jianliang Shen <jianliang.shen@arm.com>
Change-Id: I6f8b28efc3c6c5d1187586264a4cb76deae455de
6 files changed