Add xdg-menu directory for phone apps (currently dialer and messaging app)

overlay/common/etc/xdg/menus/applications-merged/phone-apps.menu

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+<!DOCTYPE Menu PUBLIC "-//freedesktop//DTD Menu 1.0//EN"
+    "http://www.freedesktop.org/standards/menu-spec/menu-1.0.dtd">
+<!-- Do not edit manually - generated and managed by xdg-desktop-menu -->
+<Menu>
+    <Name>Applications</Name>
+<Menu>
+    <Name>phone-apps</Name>
+    <Directory>phone-apps.directory</Directory>
+    <Include>
+        <Filename>dialer-app.desktop</Filename>
+        <Filename>messaging-app.desktop</Filename>
+    </Include>
+</Menu>
+</Menu>

overlay/common/usr/share/desktop-directories/phone-apps.directory

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+[Desktop Entry]
+Type=Directory
+Name=Phone
+Name[aa]=Telefoon Abnisso
+Name[am]=የ ስልክ መተግበሪያ
+Name[ast]=Aplicación Teléfonu
+Name[az]=Telefon Tətbiqetməsi
+Name[be]=Праграма-тэлефон
+Name[br]=Arload pellgomz
+Name[bs]=Telefon
+Name[ca]=Trucades
+Name[ca@valencia]=Cridades
+Name[cs]=Telefonní aplikace
+Name[cy]=Ap Ffôn
+Name[da]=Telefonprogram
+Name[de]=Telefonanwendung
+Name[el]=Εφαρμογή τηλεφώνου
+Name[en_AU]=Phone
+Name[en_GB]=Phone
+Name[eo]=Aplikaĵo Telefono
+Name[es]=Aplicación Teléfono
+Name[eu]=Telefonoa aplikazioa
+Name[fa]=اپ تلفن
+Name[fi]=Puhelinsovellus
+Name[fr]=Application de téléphonie
+Name[fr_CA]=Appli téléphonique
+Name[gd]=Aplacaid an fhòn
+Name[gl]=Aplicativo de teléfono
+Name[he]=יישום טלפון
+Name[hr]=Telefonska aplikacija
+Name[hu]=Telefon alkalmazás
+Name[ia]=Application de telephono
+Name[id]=Aplikasi Telepon
+Name[is]=Símaforrit
+Name[it]=App telefono
+Name[ja]=電話アプリ
+Name[km]=កម្មវិធី​ទូរស័ព្ទ
+Name[ko]=전화 프로그램
+Name[lv]=Tālruņa lietotne
+Name[ms]=Apl Telefon
+Name[my]=ဖုန်း app
+Name[nb]=Telefonprogram
+Name[ne]=फोन अनुप्रयोग
+Name[nl]=Telefoonapp
+Name[oc]=Aplicacion de telefonia
+Name[pa]=ਫੋਨ ਐਪ
+Name[pl]=Aplikacja telefonu
+Name[pt]=App de telefone
+Name[pt_BR]=Phone
+Name[ro]=Aplicație pentru telefonie
+Name[ru]=Телефон
+Name[sk]=Aplikácia Telefón
+Name[sl]=Mobilni program
+Name[sq]=Program Telefoni
+Name[sr]=Програм за телефонирање
+Name[sv]=Telefonapp
+Name[tr]=Telefon Uygulaması
+Name[ug]=تېلېفون ئەپى
+Name[uk]=Програма-телефон
+Name[zh_CN]=电话应用
+Name[zh_HK]=手機程式
+Name[zh_TW]=電話程式
+Icon=phone