suit: Fix JINJA path usage in suit.cmake file

In the suit.cmake file there are no token replacements
for the JINJA template files and due to that the
INPUT_ENVELOPE_JINJA_FILE variable uses the wrong value while
it uses the CMake variable from a prj.conf file.

For example setting the
`CONFIG_SUIT_ENVELOPE_TEMPLATE="${ZEPHYR_NRF_MODULE_DIR}.yaml.
jinja2` kconfig provides the wrong path to the SUIT
generator.

To fix it, I added a simple string configuration.

Signed-off-by: Arkadiusz Balys <arkadiusz.balys@nordicsemi.no>

cmake/sysbuild/suit.cmake

@@ -154,6 +154,7 @@ function(suit_create_package)
     endif()
 
     sysbuild_get(INPUT_ENVELOPE_JINJA_FILE IMAGE ${image} VAR CONFIG_SUIT_ENVELOPE_TEMPLATE KCONFIG)
+    string(CONFIGURE "${INPUT_ENVELOPE_JINJA_FILE}" INPUT_ENVELOPE_JINJA_FILE)
     suit_set_absolute_or_relative_path(${INPUT_ENVELOPE_JINJA_FILE} ${app_config_dir} INPUT_ENVELOPE_JINJA_FILE)
     sysbuild_get(target IMAGE ${image} VAR CONFIG_SUIT_ENVELOPE_TARGET KCONFIG)
     sysbuild_get(BINARY_DIR IMAGE ${image} VAR APPLICATION_BINARY_DIR CACHE)
@@ -182,6 +183,7 @@ function(suit_create_package)
   # create root envelope if defined
   if(DEFINED INPUT_ROOT_ENVELOPE_JINJA_FILE AND NOT INPUT_ROOT_ENVELOPE_JINJA_FILE STREQUAL "")
     set(ROOT_NAME ${SB_CONFIG_SUIT_ENVELOPE_ROOT_ARTIFACT_NAME})
+    string(CONFIGURE "${INPUT_ROOT_ENVELOPE_JINJA_FILE}" INPUT_ROOT_ENVELOPE_JINJA_FILE)
     suit_set_absolute_or_relative_path(${INPUT_ROOT_ENVELOPE_JINJA_FILE} ${app_config_dir} INPUT_ROOT_ENVELOPE_JINJA_FILE)
     set(ROOT_ENVELOPE_YAML_FILE ${SUIT_ROOT_DIRECTORY}${ROOT_NAME}.yaml)
     set(ROOT_ENVELOPE_SUIT_FILE ${SUIT_ROOT_DIRECTORY}${ROOT_NAME}.suit)