Cellular: Remove IPV6 and IPV4V6 as supported properties for BG96

IPV6 and IPV6V4 support is also network dependent not only modem.

Having these properties enabled for a modem requires a fallback
mechanism during PDP context activation. This mechanism is missing
at the moment and that can result in imposibility to establish
succesfull connection when network only supports IPV4 contexts.

Author: Mirela Chirica

features/cellular/framework/targets/QUECTEL/BG96/QUECTEL_BG96.cpp

@@ -43,8 +43,8 @@ static const intptr_t cellular_properties[AT_CellularBase::PROPERTY_MAX] = {
     1,  // AT_CMGF
     1,  // AT_CSDH
     1,  // PROPERTY_IPV4_STACK
-    1,  // PROPERTY_IPV6_STACK
-    1,  // PROPERTY_IPV4V6_STACK
+    0,  // PROPERTY_IPV6_STACK
+    0,  // PROPERTY_IPV4V6_STACK
     1,  // PROPERTY_NON_IP_PDP_TYPE
     1,  // PROPERTY_AT_CGEREP
 };