msm: camera2: isp: KPI opt for bundling ioctls

iface was doing multiple ioctls during camera preview start;
Changed to bundle all ioctl subscription into one single call

Change-Id: I60cbf9d957608ec1f437b42ec3a671c77280aa0c
Signed-off-by: Senthil Kumar Rajagopal <skrajago@codeaurora.org>