zephyr: Fix issue with sysbuild if something else is named mcuboot

Fixes an issue which can occur in tests whereby an application
has the name mcuboot but is not mcuboot itself

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

boot/zephyr/sysbuild/CMakeLists.txt

@@ -4,9 +4,9 @@ function(mathup num align result)
 endfunction()
 
 function(${SYSBUILD_CURRENT_MODULE_NAME}_pre_image_cmake)
-  cmake_parse_arguments(POST_IMAGE_CMAKE "" "IMAGE" "IMAGES" ${ARGN})
+  cmake_parse_arguments(PRE_IMAGE_CMAKE "" "IMAGE" "IMAGES" ${ARGN})
 
-  if(NOT "${POST_IMAGE_CMAKE_IMAGE}" STREQUAL "mcuboot")
+  if(NOT "${PRE_IMAGE_CMAKE_IMAGE}" STREQUAL "mcuboot" OR NOT SB_CONFIG_BOOTLOADER_MCUBOOT)
     return()
   endif()
 
@@ -21,7 +21,7 @@ endfunction(${SYSBUILD_CURRENT_MODULE_NAME}_pre_image_cmake)
 function(${SYSBUILD_CURRENT_MODULE_NAME}_post_image_cmake)
   cmake_parse_arguments(POST_IMAGE_CMAKE "" "IMAGE" "IMAGES" ${ARGN})
 
-  if(NOT "${POST_IMAGE_CMAKE_IMAGE}" STREQUAL "mcuboot")
+  if(NOT "${POST_IMAGE_CMAKE_IMAGE}" STREQUAL "mcuboot" OR NOT SB_CONFIG_BOOTLOADER_MCUBOOT)
     return()
   endif()