kas-poky-rpi: add kas file

The kas tool provides an easy mechanism to setup bitbake based projects.

As explained in [1] the key features provided by kas are:

- clone and checkout bitbake layers
- create default bitbake settings (machine, arch, ...)
- launch minimal build environment, reducing risk of host contamination
- initiate bitbake build process

So, let's create a minimal example in this layer to build an image with a
small effort. This seems interesting for new users of the meta-raspberrypi.

For example:

$: sudo pip3 install kas
$: mkdir rpi
$: cd rpi
$: git clone https://github.com/agherzan/meta-raspberrypi.git
$: kas build meta-raspberrypi/kas-poky-rpi.yml

and that's all !

To adjust the construction with specific options (I2C, SPI, ...), simply add
a section as follows:

local_conf_header:
  rpi-specific: |
    ENABLE_I2C = "1"
    RPI_EXTRA_CONFIG = "dtoverlay=pi3-disable-bt"

To configure the machine, the user have to update the 'machine' variable.
And the same for the 'distro'.

[1] - https://kas.readthedocs.io/en/1.0/userguide.html

Signed-off-by: Pierre-Jean Texier <pjtexier@koncepto.io>

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