ohos-image.bbclass: Avoid duplicates in install_task when deploying boot assets

The code detects when boot assets would overwrite something already
deployed/installed in the rootfs. This helps to avoid breaking packaging
at runtime. On the other hand, if IMAGE_BOOT_FILES has duplicates, this
check will fail when trying to install the same file multiple times. To
avoid this, treat the install_task as a set.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

meta-ohos-core/classes/ohos-image.bbclass

@@ -160,7 +160,7 @@ python deploy_boot_artifacts_to_rootfs() {
         else:
             install_task.append((src, dst))
 
-    for task in install_task:
+    for task in set(install_task):
         src_path, dst_path = task
         bb.debug(1, 'Install %s as %s' % (src_path, dst_path))
         if os.path.exists(os.path.join(rootfs_dir, dst_path)):