Rpi/embedded data support/rpi 6.6.y

[jmondi]

This branch backports embedded data support to rpi-6.6.y

It includes framework changes to support embedded data and

• CFE from mainline
• Unicam from mainline
• Aligns imx219 with mainline
• Sensor patches from Naush to support embedded data

The branch compiles with rpi defconfig but fails for other drivers not part of defconfig. I'm working to backport the necessary changes there too.

The associated libcamera branch will be pushed soon.