apns: Add IPV4V6 to EE (UK)

As per https://android.stackexchange.com/a/233395,
without it data transfers may fail with PDN_IPV4_CALL_DISALLOWED

Closes: https://gitlab.com/LineageOS/issues/android/-/issues/3068

Change-Id: I1a663eafa4d913f45478f4dcf062f25a76411abf