Build: Merge tfm_partition_defs into tfm_config

CMake target tfm_partition_defs is merged into tfm_config. Same change
is also needed in tf-m-tests.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I79dc74d5acfc73a290f1288e3c0ecd76ab81be85
11 files changed