libcamera: ipa: Raspberry Pi IPA

Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and
associated libraries.

All code is licensed under the BSD-2-Clause terms.
Copyright (c) 2019-2020 Raspberry Pi Trading Ltd.

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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+# _libcamera_ for the Raspberry Pi
+
+Raspberry Pi provides a fully featured pipeline handler and control algorithms
+(IPAs, or "Image Processing Algorithms") to work with _libcamera_. Support is
+included for all existing Raspberry Pi camera modules.
+
+_libcamera_ for the Raspberry Pi allows users to:
+
+1. Use their existing Raspberry Pi cameras.
+1. Change the tuning of the image processing for their Raspberry Pi cameras.
+1. Alter or amend the control algorithms (such as AGC/AEC, AWB or any others)
+   that control the sensor and ISP.
+1. Implement their own custom control algorithms.
+1. Supply new tunings and/or algorithms for completely new sensors.
+
+## How to install and run _libcamera_ on the Raspberry Pi
+
+Please follow the instructions [here](https://github.com/raspberrypi/documentation/tree/master/linux/software/libcamera/README.md).
+
+## Documentation
+
+Full documentation for the _Raspberry Pi Camera Algorithm and Tuning Guide_ can
+be found [here](https://github.com/raspberrypi/documentation/tree/master/linux/software/libcamera/rpi_SOFT_libcamera_1p0.pdf).