Add specific name logging in failure scenarios of PropertyValue

Hard to track down value/expression issues currently when they are not being named.

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/layers/PropertyValue.java

@@ -63,7 +63,7 @@ public class PropertyValue<T> {
         ? Expression.Converter.convert((JsonArray) value)
         : (Expression) value;
     } else {
-      Logger.w(TAG, "not an expression, try PropertyValue#getValue()");
+      Logger.w(TAG, String.format("%s not an expression, try PropertyValue#getValue()", name));
       return null;
     }
   }
@@ -88,7 +88,7 @@ public class PropertyValue<T> {
       // noinspection unchecked
       return value;
     } else {
-      Logger.w(TAG, "not a value, try PropertyValue#getExpression()");
+      Logger.w(TAG, String.format("%s not a value, try PropertyValue#getExpression()", name));
       return null;
     }
   }
@@ -124,4 +124,4 @@ public class PropertyValue<T> {
   public String toString() {
     return String.format("%s: %s", name, value);
   }
-}
+}