ci: Ensure tests are in the Corstone-1000 flash image

To ensure the psa and optee tests are included in the initramsfs based
rootfs included within the flash image so the tests can be run.

Signed-off-by: Drew Reed <Drew.Reed@arm.com>

ci/corstone1000-common.yml

@@ -38,10 +38,10 @@ local_conf_header:
     RRECOMMENDS:${KERNEL_PACKAGE_NAME}-base = ""
 
     # all optee packages
-    IMAGE_INSTALL += "optee-client"
+    CORE_IMAGE_EXTRA_INSTALL += "optee-client"
 
     # TS PSA API tests commands for crypto, its, ps and iat
-    IMAGE_INSTALL += "packagegroup-ts-tests-psa"
+    CORE_IMAGE_EXTRA_INSTALL += "packagegroup-ts-tests-psa"
 
 target:
   - core-image-minimal