rust: Don't suppress adding deps for rust-project.json device override

When switching from an initially found host module to a later found
device module, we passed `cInfo.Deps` through. This actually suppresses
addition of some modules, which was not the intention.

Bug: 336695421
Test: SOONG_GEN_RUST_PROJECT=1 m blueprint_tests
Test: check rust-projects.json manually afterwards for deps
Change-Id: Ib90f9c755e07f88e85a3b3cbd9bc698cce8af038