Move java.sdkSpec to the android package

... in preparation for making the handling of sdk versions consistent
across java and cc modules.

Bug: 175678607
Test: m
Change-Id: I598f0454bce9b7320621022115412fbe97403945
diff --git a/java/droidstubs.go b/java/droidstubs.go
index d7a0668..3469616 100644
--- a/java/droidstubs.go
+++ b/java/droidstubs.go
@@ -474,7 +474,7 @@
 func (d *Droidstubs) GenerateAndroidBuildActions(ctx android.ModuleContext) {
 	deps := d.Javadoc.collectDeps(ctx)
 
-	javaVersion := getJavaVersion(ctx, String(d.Javadoc.properties.Java_version), sdkContext(d))
+	javaVersion := getJavaVersion(ctx, String(d.Javadoc.properties.Java_version), android.SdkContext(d))
 
 	// Create rule for metalava