platform: generic-x86_64: Remove external/lk/lib/rust_support dependency

This path does not work in the android manifest and we are addding this
as an implicit dependendy for all kernel rust modules anyway.

Bug: 304585390
Test: trusty/vendor/google/aosp/scripts/build.py generic-x86_64-test
Change-Id: Ifd5287a4969ec1bdfa641925ff8f496ae6c7d3f4
1 file changed