Add new audio channel mode dialog layout for new Bluetooth developer option

<?xml version="1.0" encoding="utf-8"?>

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<ScrollView

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="wrap_content">

    <LinearLayout

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:orientation="vertical"

        android:padding="8dp">

        <RadioGroup

            android:id="@+id/bluetooth_audio_channel_mode_radio_group"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_marginStart="@dimen/developer_option_dialog_margin_start">

            <include

                android:id="@+id/bluetooth_audio_channel_mode_default"

                layout="@layout/preference_widget_dialog_radiobutton"/>

            <include

                android:id="@+id/bluetooth_audio_channel_mode_mono"

                layout="@layout/preference_widget_dialog_radiobutton"/>

            <include

                android:id="@+id/bluetooth_audio_channel_mode_stereo"

                layout="@layout/preference_widget_dialog_radiobutton"/>

        </RadioGroup>

        <include

                android:id="@+id/bluetooth_audio_codec_help_info"

                layout="@layout/preference_widget_dialog_summary"/>

    </LinearLayout>

</ScrollView>