Added 3 MIPI commands to set/get the ELVSS setting information from the MIPI DSI panel. Port from a5b269d7. Change-Id: I3aa1612c7afc35247f0db86ee1dd8484bae8d7b4 Signed-off-by: daiss1 <daiss1@motorola.com> Reviewed-on: https://gerrit.mot.com/1469340 SLTApproved: Slta Waiver SME-Granted: SME Approvals Granted Tested-by: Jira Key Reviewed-by: Guobin Zhang <zhanggb@motorola.com> Submit-Approved: Jira Key Reviewed-by: Bang Nguyen <bangnguyen@motorola.com> Reviewed-by: Dezhen Hou <houdz1@motorola.com> Reviewed-on: https://gerrit.mot.com/1509787 Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>