arm64: dts: hikey960: pinctrl: add more pinmux and pinconfig

This commit adds more pinmux and pinctrl information for devices
on HiKey960, including i2c, spi, cam, uart, ufs, pcie, csi, pwr_key,
isp, sd/sdio, i2s, and usb.

Signed-off-by: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
Signed-off-by: Chen Jun <chenjun14@huawei.com>
Signed-off-by: Guodong Xu <guodong.xu@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>