Fix "active_panel" undefined build error in CONFIG_DRM_PANEL_EVENT_NOTIFICATIONS Change-Id: I45b9c513b0abb0c35ed95383b398f1b9bac0bb22 Reviewed-on: https://gerrit.mot.com/2203843 SME-Granted: SME Approvals Granted SLTApproved: Slta Waiver Tested-by: Jira Key Reviewed-by: Jichao Zou <zoujc@motorola.com> Submit-Approved: Jira Key