This patch implements errors=remount-ro for exfat. Port of cf4fa60 and 58ec900 on 8996 with minor change for updated submit_io() interface in kernel 4.9. Change-Id: Iee791a99216ecf9f710adffa681706e761f97d8f Signed-off-by: Shiyong Li <a22381@motorola.com> Reviewed-on: https://gerrit.mot.com/1102176 SME-Granted: SME Approvals Granted SLTApproved: Slta Waiver Tested-by: Jira Key Reviewed-by: Igor Kovalenko <igork@motorola.com> Submit-Approved: Jira Key