[android] Make Marker anchor property private

Fixes #2652

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/Marker.java

@@ -48,15 +48,15 @@ public final class Marker extends Annotation {
         return (lat == otherLat && otherLng == lng);
     }
 
-    public Point getAnchor() {
+    Point getAnchor() {
         return new Point((int)anchorU, (int)anchorV);
     }
 
-    public float getAnchorU() {
+    float getAnchorU() {
         return anchorU;
     }
 
-    public float getAnchorV() {
+    float getAnchorV() {
         return anchorV;
     }
 
@@ -188,7 +188,7 @@ public final class Marker extends Annotation {
     }
 
     private void showInfoWindow(InfoWindow iw) {
-        iw.open(this, getPosition(), (int) anchorU, (int) anchorV + topOffsetPixels);
+        iw.open(this, getPosition(), 0, topOffsetPixels);
         iw.setBoundMarker(this);
         infoWindowShown = true;
     }

android/java/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/annotations/MarkerOptions.java

@@ -12,7 +12,7 @@ public final class MarkerOptions {
         marker = new Marker();
     }
 
-    public MarkerOptions anchor(float u, float v) {
+    private MarkerOptions anchor(float u, float v) {
         marker.setAnchor(u, v);
         return this;
     }
@@ -27,11 +27,11 @@ public final class MarkerOptions {
         return this;
     }
 
-    public float getAnchorU() {
+    private float getAnchorU() {
         return marker.getAnchorU();
     }
 
-    public float getAnchorV() {
+    private float getAnchorV() {
         return marker.getAnchorV();
     }