Add temp/libcamera
Add APKBUILD for libcamera.
libcamera natively supports the RK3399 ISP and the imx258 camera sensor. A video for a preview window running with (perfectible) AWB and AGC is available https://nc.nibble.pw/s/s8FC43sYzzZJ7X2
In order to run libcamera a few kernel tweaks are required, some of which are easily upstreamable (ie missing Kconfig options) other are less trivial (the downstream ov8858 driver has to be improved).
Linking here to: megapixels#2 megapixels#56