Remove preliminary mark from Bengali Akkhor keyboard

Bug: 16143057
Change-Id: I4f048a15b8b810f47622c8ec87773ff7470d20f2

java/res/xml/method.xml

@@ -28,7 +28,7 @@
     be_BY: Belarusian (Belarus)/east_slavic
     bg: Bulgarian/bulgarian
     bg: Bulgarian/bulgarian_bds
-    bn_BD: Bengali (Bangladesh)/bengali_akkhor # This is a preliminary keyboard layout.
+    bn_BD: Bengali (Bangladesh)/bengali_akkhor
     bn_IN: Bengali (India)/bengali
     ca: Catalan/spanish
     cs: Czech/qwertz
@@ -181,8 +181,6 @@
             android:imeSubtypeExtraValue="KeyboardLayoutSet=bulgarian_bds,EmojiCapable"
             android:isAsciiCapable="false"
     />
-    <!-- TODO: This Bengali (Bangladesh) keyboard is a preliminary layout.
-               This isn't based on the final specification. -->
     <subtype android:icon="@drawable/ic_ime_switcher_dark"
             android:label="@string/subtype_generic"
             android:subtypeId="0xa2144b0c"