scripts: extract_dts_include: convert inherited 'id' to 'node_type'

During yaml collapse step, convert inherited 'id' key to 'node_type'.
With this new 'node_type', it's is more easy to apply common treatment
to all bindings that include the same base yaml file but might not
have similar bindings/constraint naming convention.

Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>