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This patch adds two v4l2 events, start/stop streaming, for userspace to subscribe. With these events, userspace could init/de-init 3A tuning in proper time. Only if isp sub-device input format is Raw Bayer and output format is YUV, the 3A tuning is required. Change-Id: I027d603fcf6d6901ebcd3762d0889ef8f7603601 Signed-off-by: Hu Kejun <william.hu@rock-chips.com> Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>