suit: manifest-controlled variables

Replace platform native_posix to native_sim

Ref: NCSDK-30530

Signed-off-by: Sylwester Konczyk <[email protected]>

Author: SylwesterKonczyk

tests/subsys/suit/manifest_variables/boards/native_posix.conf renamed to tests/subsys/suit/manifest_variables/boards/native_sim.conf

@@ -1,6 +1,6 @@
 tests:
   suit-platform.integration.manifest_variables:
-    platform_allow: native_posix
+    platform_allow: native_sim
     tags: suit_platform suit ci_tests_subsys_suit
     integration_platforms:
-      - native_posix
+      - native_sim