tools: ynl-gen: use family c-name in notifications

Family names may include dashes. Fix notification handling
code gen to the c-compatible name.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Link: https://patch.msgid.link/20250410014658.782120-12-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>