Provisioning Network type constant

Added mertrics variable to network type used while provisioning.
Happens only once, when the device is provisioned.
It shouldn't be more than 10 times for a device's life.

Test: Not required

Bug: 31425625
Bug: 31425628

Change-Id: I5eccbda7ffd93f1bcceb37b8d485895598fa59a8
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index da041da..90ccca2 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2566,6 +2566,9 @@
     // OPEN: Settings > Wireless > Manage wireless plan dialog
     DIALOG_MANAGE_MOBILE_PLAN = 609;
 
+    // ACTION: Logs the network type of device while provisioning
+    PROVISIONING_NETWORK_TYPE = 610;
+
     // ---- End O Constants, all O constants go above this line ----
 
     // Add new aosp constants above this line.