Handle soong config vars for string attrs

Previously if there was a value set outside of product variables and one
inside a conditions default soong config var, we would ignore the
conditions default. Now, we maintain the conditions default and use
the root value in cases where there is not a value for a product
variable.

Test: go test soong tests
Change-Id: Ic991e3aebe5bb6039353f4e3d25625e7c5190f96
diff --git a/bp2build/testing.go b/bp2build/testing.go
index 1f9874c..c340a8f 100644
--- a/bp2build/testing.go
+++ b/bp2build/testing.go
@@ -453,6 +453,14 @@
 			}
 		}
 	}
+	productVariableProps := android.ProductVariableProperties(ctx)
+	if props, ok := productVariableProps["String_literal_prop"]; ok {
+		for c, p := range props {
+			if val, ok := p.(*string); ok {
+				strAttr.SetSelectValue(c.ConfigurationAxis(), c.SelectKey(), val)
+			}
+		}
+	}
 
 	paths.ResolveExcludes()