gn2bp: Fix some protos include_dirs

* Some net files have different include_dirs for protos generated. If the generated file is at A/B/C/src/D/E. The net file expect the
export include dir to be A/B/C/src/

Test: None
Change-Id: I9ebe54094ea6bd2b00645be2bf724889dbcb3c1f
2 files changed