add bc12 type read iio seperately Change-Id: Id5f3b8952f1ef8fb1dac85682bd09346b9c4c0b5 Signed-off-by: xieqiong2 <xieqiong2@lenovo.com> Reviewed-on: https://gerrit.mot.com/2273506 SME-Granted: SME Approvals Granted SLTApproved: Slta Waiver Tested-by: Jira Key Reviewed-by: Wei Xu <xuwei9@lenovo.com> Reviewed-by: Wang Wang <wangwang1@lenovo.com> Submit-Approved: Jira Key