[ABS] Replace EFL internal API.
This patch replace EFL internal API (efl_parent_get)
with ELM public API (elm_object_parent_widget_get).

Reference: submit/tizen_5.5_wearable_hotfix/20201026.184309
Commit id: 3cefad219fe531e932db84f726dd0a7a5161d715
Requested by: None
SDK rootstrap version: 20201019_1