Allow sdk and core modules to use sysprop_library

This allows javaSdk and javaCore modules to link against Public stub of
Platform owned sysprop_library.

Bug: 141246285
Test: m nothing
Change-Id: Ie11c43cc72ddd0ee13e4163955775c13eb9dbe92
diff --git a/java/java.go b/java/java.go
index 5afdc2f..4c6a5a5 100644
--- a/java/java.go
+++ b/java/java.go
@@ -627,12 +627,9 @@
 			}
 
 			linkType, _ := j.getLinkType(ctx.ModuleName())
-			if linkType == javaSystem {
+			// only platform modules can use internal props
+			if linkType != javaPlatform {
 				ret[idx] = stub
-			} else if linkType != javaPlatform {
-				ctx.PropertyErrorf("sdk_version",
-					"can't link against sysprop_library %q from a module using public or core API",
-					lib)
 			}
 		}