Add support for lopper to generate partial dts

Currently ImageBuilder can compile and merge partial dts obtained from
a repository specified using PASSTHROUGH_DTS_REPO. With the recent
changes done in the lopper, we can use it to generate partial dts
automatically (to some extent as this is still an early support).

Introduce LOPPER_PATH option to specify a path to a lopper.py script,
the main script in the Lopper repository, that if set, will invoke lopper
to generate partial dts for the passthrough devices specified in
DOMU_PASSTHROUGH_PATHS.

Introduce LOPPER_CMD option to specify custom command line arguments
(if needed) for lopper's extract assist.

Example usage:
LOPPER_PATH="/home/user/lopper/lopper.py"
DOMU_PASSTHROUGH_PATHS[0]="/axi/spi@ff0f0000 /axi/serial@ff010000"

Signed-off-by: Michal Orzel <michal.orzel@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

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