mgmt: updatehub: Fix mark for update

This fixes compatibility with recent bootutils API.

Fixes #69297

Signed-off-by: Gerson Fernando Budke <gerson.budke@ossystems.com.br>
(cherry picked from commit 94cd46d)

subsys/mgmt/updatehub/updatehub_storage.c

@@ -73,7 +73,7 @@ int updatehub_storage_mark_partition_to_upgrade(struct updatehub_storage_context
  return -EINVAL;
  }
 
- return boot_request_upgrade_multi(partition_id, BOOT_UPGRADE_TEST);
+ return boot_request_upgrade(BOOT_UPGRADE_TEST);
 }
 
 int updatehub_storage_mark_partition_as_confirmed(const uint32_t partition_id)