title: Attribute android:letterSpacing not working in BottomNavigationView
body: <p>I am using BottomNavigationView and trying to set the android:letterSpacing attribute on texts by defining it on styles.xml, but whatever value I put, it does not make any difference, but if I use it on textview or something like that, it works perfectly!</p>
  
  <pre><code>&lt;com.google.android.material.bottomnavigation.BottomNavigationView
              android:id="@+id/bottom_navigation"
              android:layout_width="match_parent"
              android:layout_height="56dp"
              android:theme="@style/Widget.BottomNavigationView"
              app:itemBackground="@drawable/ripple"
              app:labelVisibilityMode="labeled"
              app:menu="@menu/navigation"
              app:itemIconTint="@drawable/bottom_navigation_item_color"
              app:itemTextColor="@drawable/bottom_navigation_item_color"
         app:layout_constraintTop_toBottomOf="@id/multicontent_container"
              app:layout_constraintBottom_toBottomOf="parent"
              app:layout_constraintLeft_toLeftOf="parent"
              app:layout_constraintRight_toRightOf="parent"
              app:elevation="8dp"/&gt;
  
  &lt;style name="Widget.BottomNavigationView" parent="Widget.Design.BottomNavigationView"&gt;
          &lt;item name="fontFamily"&gt;@font/bottom_navigation_font&lt;/item&gt;
          &lt;item name="android:textSize"&gt;12sp&lt;/item&gt;
          &lt;item name="android:lineSpacingExtra"&gt;4sp&lt;/item&gt;
          &lt;item name="android:letterSpacing"&gt;-1&lt;/item&gt;
      &lt;/style&gt;
  </code></pre>