ARM: dts: sun8i: V3/V3s/S3/S3L: add pinctrl for 8-bit parallel CSI

The CSI1 controller of V3/V3s/S3/S3L SoCs is used for parallel CSI.

As we're going to add support for Pine64 SCC board, which uses 8-bit
parallel CSI (and the MCLK output), add the pinctrl node of 8-bit
CSI and MCLK to the DTSI file.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20200923010122.148661-1-icenowy@aosc.io