Merge pull request ARMmbed#13432 from MultiTechSystems/fix-PDP-type

Enable PDP type IPV6 and IPV4V6 to support more cellular service prov…

Author: 0xc0170

connectivity/drivers/cellular/TELIT/HE910/TELIT_HE910.cpp

@@ -33,8 +33,8 @@ static const intptr_t cellular_properties[AT_CellularDevice::PROPERTY_MAX] = {
     1,  // AT_CMGF
     1,  // AT_CSDH
     1,  // PROPERTY_IPV4_STACK
-    0,  // PROPERTY_IPV6_STACK
-    0,  // PROPERTY_IPV4V6_STACK
+    1,  // PROPERTY_IPV6_STACK
+    1,  // PROPERTY_IPV4V6_STACK
     0,  // PROPERTY_NON_IP_PDP_TYPE
     1,  // PROPERTY_AT_CGEREP,
     1,  // PROPERTY_AT_COPS_FALLBACK_AUTO