Add Ipv6ProvisioningMode enum proto in NetworkIpProvisioningReported.

This field checks which IPv6 provisioning mode is triggered for the
current connection, and gives us how often the device starts from DHCPv6
prefix delegation feature.

We can aggregate the IP provisioning event with
IPV6_PROV_MODE_DHCP6_PD_HEURISTIC enum value and divide by the total
IPv6 provisioning event count, to know how often this feature is used
for IPv6 provisioning.

Bug: 323767004
Test: m, flash device, boot
Change-Id: Ief38108cfdda314dab9e8b4257f41766daec78f2
1 file changed