apns: Clean up Austrian carriers

* There was a lot of shuffling and renaming going on
* A1 & Yesss do support IPv6, but NOT on roaming

For reference:
a1: https://www.a1.net/handyhilfe/topic/internet/apn-einstellungen/device/samsung/galaxy-a52

magenta/t-mobile: https://www.magenta.at/hilfe-service/services/hardwaresupport/device/samsung/galaxy-s9/topic/internet/internet-einrichten-apn-einstellungen/choice/magenta-apn-einstellungen

3: https://www.drei.at/de/info/support/handyeinstellungen/

hot: https://www.hot.at/config/faqs/HoT_Einstellungen_Endgera_te.pdf

bob: https://www.bob.at/wp-content/uploads/IOS_APNs.pdf

yesss: https://www.yesss.at/fragen/erste-schritte-mit-yesss#faq_62

spusu: https://www.spusu.at/faq-apn

Change-Id: I2b3aab5f4c176a3dbc8e609de354b84586094ab2