[RESEND PATCH] dt-bindings: writing-schema: install from PyPI repository

Installing dtschema from github.com/devicetree-org is not needed anymore because dtschema is now part of regular PyPI repository. In certain cases it might cause some troubles as it brings latest master version, not the stable release: $ pip3 show dtschema Version: 2020.8.2.dev4+g341f3e3

[PATCH] dt-bindings: writing-schema: install from PyPI repository

Installing dtschema from github.com/devicetree-org is not needed anymore because dtschema is now part of regular PyPI repository. In certain cases it might cause some troubles as it brings latest master version, not the stable release: $ pip3 show dtschema Version: 2020.8.2.dev4+g341f3e3