Merge branch 'tools-ynl-add-schema-checking'

Merge branch 'tools-ynl-add-schema-checking'

Donald Hunter says:

====================
tools: ynl: add schema checking

Add schema checking and yaml linting for the YNL specs.

Patch 1 adds a schema_check make target using a pyynl --validate option
Patch 2 adds a lint make target using yamllint
Patches 3,4 fix issues reported by make -C tools/net/ynl lint schema_check
====================

Link: https://patch.msgid.link/20251127123502.89142-1-donald.hunter@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>