Build: Merge tfm_partition_defs into tfm_config

The purpose of tfm_partition_defs is to expose the partition related
compile definitions, which can easily be covered by tfm_config.
So merge tfm_partition_defs into tfm_config to reduce the number of
CMake targets.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I8ac9983ece670383183459554c9a22e1e8e22d66
17 files changed