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
diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index 9b853cd..b991386 100755
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -60,7 +60,7 @@
 # It can be replaced by NS side configurations later.
 target_link_libraries(tfm_ns_interface
     INTERFACE
-        tfm_partition_defs
+        tfm_config
 )
 
 target_compile_definitions(tfm_ns_interface