Sandbox libchrome genrules

These genrules already work with sandboxing, but they write the path
to a tool into a comment in their outputs, which differs between
sandboxing and non-sandboxing builds. This made genrule_sandbox_test.py
think that they didn't work with sandboxing.

Bug: 307824623
Test: ./build/soong/tests/genrule_sandbox_test.py libchrome-include libchrome-crypto-include
Change-Id: Ibcad839e9d374a2f992d051805548c58303cf7ef