cmake: sybuild: partition_manager: Fix wrongly using all images

Fixes wrongly using all images for the network core when it should
instead only use those dedicated to the network core

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

Author: nordicjm

cmake/sysbuild/partition_manager.cmake

@@ -436,7 +436,11 @@ foreach (image ${IMAGES})
     list(APPEND header_files ${${image}_binary_dir}/${generated_path}/pm_config.h)
     get_property(domain_app GLOBAL PROPERTY DOMAIN_APP_${domain})
     if(NOT DEFINED domain OR "${domain_app}" STREQUAL "${image}")
-      list(APPEND input_files  ${${image}_input_files})
+      if(NOT DEFINED domain)
+        list(APPEND input_files  ${${image}_input_files})
+      else()
+        list(APPEND ${domain}_input_files  ${${image}_input_files})
+      endif()
     endif()
   endif()
 endforeach()