rust: Remove rust_ffi_rlibs, keep rust_ffi_static

rust_ffi_static and rust_ffi_rlibs both alias to rust_library_rlib now.
We need to think about whether we need these aliases at all.

There are no users of rust_ffi_rlibs at the moment as developers are
continuing to declare rust_ffi_static modules. Let's remove this alias
in the meantime at least to simplify things.

Bug: 350633786
Bug: 383552450
Test: m blueprint_tests && m rust
Change-Id: I6be895ddbffc5ac6303f2edc9ab20f7c20cd1591
diff --git a/cc/fuzz.go b/cc/fuzz.go
index 26ac7d1..122871f 100644
--- a/cc/fuzz.go
+++ b/cc/fuzz.go
@@ -638,7 +638,7 @@
 	ctx.WalkDeps(func(child, parent android.Module) bool {
 
 		// If this is a Rust module which is not rust_ffi_shared, we still want to bundle any transitive
-		// shared dependencies (even for rust_ffi_rlib or rust_ffi_static)
+		// shared dependencies (even for rust_ffi_static)
 		if rustmod, ok := child.(LinkableInterface); ok && rustmod.RustLibraryInterface() && !rustmod.Shared() {
 			if recursed[ctx.OtherModuleName(child)] {
 				return false