[FM] "Speaker on/headset" should not be available while BT earphone is connected

Launch FM Radio and play -> Turn on BT and connect with
BT earphone -> Enter FM again and check "Speaker on/headset"
, "Speaker on/headset" will be available.

The fix is to also check BT headset is connected or not when
enabling menu item.

Bug 18795153

from: https://partner-android-review.googlesource.com/#/c/192377/2

Change-Id: Ia6d78b85563389f193860820447273a27e76d050
Signed-off-by: Benson Huang <benson.huang@mediatek.com>
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1b68eba..cebce11 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -29,6 +29,7 @@
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
     <uses-permission android:name="android.permission.ACCESS_FM_RADIO" />
     <uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
+    <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.MODIFY_AUDIO_ROUTING" />
     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />