Autogen: Remove <target_name>_autogen_timestamp_deps target

Since 2bfaaf6f6ed7481438bec08771992ea5152b5453 reorganized the dependency order for the `timestamp` target,
`<target_name>_autogen_timestamp_deps` is genetared as `phony edge with no inputs`. So this commit removes
`<target_name>_autogen_timestamp_deps`.

The dependency graph before
original dependencies of '_autogen' target <- _autogen_timestamp_deps <-'/timestamp' file <- '_autogen' target

The dependency graph after
original dependencies of '_autogen' target <-'/timestamp' file <- '_autogen' target

Fixes: #26080
1 file changed