Autogen: Forward dependencies when Makefile & DEPFILE are used

Since !8570 (merged) CMake does not generate the correct dependency graph when both Makefile and DEPFILE are used. The build of <target_name>_autogen_timestamp_deps fails due to missing dependencies. To tackle that problem, forward target dependencies to both <target_name>_autogen_timestamp_deps and <target_name>_autogen instead of just <target_name>_autogen.

Fixes: #25600 (closed)
Backport: release
Topic-rename: autogen-makefile-depfile