Update our .gitattributes to properly list our generated files. (#9218)
Update our .gitattributes to properly list our generated files. (#9218)

There were two issues:

1) Some generated files were never in "gen" directories to start with.

2) When we moved a bunch of files from "gen" to "zap-generated"
   directories, we didn't update .gitattributes.
project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip