Allow v4l2r access to libc_uapi_headers

The v4l2r rust crate depends on v4l2 headers from Linux to build
generated bindings. When building this crate for a glibc host the
headers in our toolchain are too old and must be overridden. Use the
bionic copies because they have been scrubbed.

Bug: 331411274
Change-Id: I249cd713b128739d8d9a1e5a5e9fb03d7fef335d
diff --git a/libc/Android.bp b/libc/Android.bp
index a4f2c69..1bf7ac3 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -1790,6 +1790,7 @@
     name: "libc_uapi_headers",
     visibility: [
         "//external/musl",
+        "//external/rust/crates/v4l2r/android",
     ],
     llndk: {
         llndk_headers: true,