Add LinuxBionic toolchain to Rust

The LinuxBionic toolchain wasn't defined for Rust.

This would lead to build breakage if a CC module that targeted Linux
Bionic linked against a Rust FFI module.

Bug: 174873186
Test: Build breakage no longer occurs if CC module with Rust dependency
      is built for the Linux Bionic target.
Change-Id: I39df7b9a29372986c9beeb1fe5602140d805d731
diff --git a/rust/config/Android.bp b/rust/config/Android.bp
index e0cc4ce..1f0109f 100644
--- a/rust/config/Android.bp
+++ b/rust/config/Android.bp
@@ -13,6 +13,7 @@
         "toolchain.go",
         "allowed_list.go",
         "x86_darwin_host.go",
+        "x86_linux_bionic_host.go",
         "x86_linux_host.go",
         "x86_device.go",
         "x86_64_device.go",