[COMMON] fimc-is2: do not use fast AF trigger when Precapture trigger

[COMMON] fimc-is2: do not use fast AF trigger when Precapture trigger

 PR JIRA ID: CPR-990

CRs-fixed: (CR)

Change-Id: Idb6311be87729c3e2119199e4047124a6733e9b8
Signed-off-by: Wooyeon Kim <wooy88.kim@samsung.com>
Reviewed-on: https://gerrit.mot.com/1342458
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Dawei Wang <wangdw10@motorola.com>
Reviewed-by: Biming Li <libm1@motorola.com>
Reviewed-by: Zhichao Chen <chenzc2@motorola.com>
Submit-Approved: Jira Key