rust: Define UseSdk for Rust modules

Rust modules have the Sdk_version property now, so UseSdk should be able
to return non-false values now.

Bug: 203478530
Test: m & m rust
Change-Id: I468007880ba8688c127965b17e65230bc9aba113
diff --git a/rust/rust.go b/rust/rust.go
index 5cc8c07..9082678 100644
--- a/rust/rust.go
+++ b/rust/rust.go
@@ -377,6 +377,9 @@
 }
 
 func (mod *Module) UseSdk() bool {
+	if cc.CanUseSdk(mod) {
+		return String(mod.Properties.Sdk_version) != ""
+	}
 	return false
 }