media: rkisp1: add ISP1 statistics driver

Add the capture video driver for rockchip isp1 statistics block.

Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>
Signed-off-by: Shunqian Zheng <zhengsq@rock-chips.com>
Signed-off-by: Yichong Zhong <zyc@rock-chips.com>
Signed-off-by: Jacob Chen <cc@rock-chips.com>
Signed-off-by: Eddie Cai <eddie.cai.linux@gmail.com>
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>
Signed-off-by: Allon Huang <allon.huang@rock-chips.com>
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
[update for upstream]
Signed-off-by: Helen Koike <helen.koike@collabora.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Series-changes: 7
- s/strlcpy/strscpy
- sort out the locks in isp stats
- code styling and checkpatch fixes