Allow bring up MMTEL network in non-vope area if configured

Ideally, IMS will request IMS capability only, and FWK will add MMTEL capability to the network to accurately reflect whether in voPS or non-voPS area.

In the case where MMTEL capability is still requested:
-  control whether the MMTEL network can be brought up in no-vops area: ims_pdn_enabled_in_no_vops_support_int_array
-  control whether allow lingering the MMTEL network in no-vops area:
   ims_pdn_enabled_in_no_vops_support_int_array or ims.keep_pdn_up_in_no_vops_bool
-  control whether delay tear down IMS network for on-going voice call for a variety of tear down reason: delay_ims_tear_down_until_call_end_bool

Bug: 241198464
Test: combination of call scenarios in bug + data browsing + b/296306375#comment94
Change-Id: I6946b47f0362f489577356883460536472171789
diff --git a/flags/data.aconfig b/flags/data.aconfig
index 260d983..0bcd4bd 100644
--- a/flags/data.aconfig
+++ b/flags/data.aconfig
@@ -12,4 +12,11 @@
   namespace: "telephony"
   description: "Relax handover tear down if the device is currently in voice call."
   bug: "270895912"
-}
\ No newline at end of file
+}
+
+flag {
+  name: "allow_mmtel_in_non_vops"
+  namespace: "telephony"
+  description: "Allow bring up MMTEL in nonVops area specified by carrier config."
+  bug: "241198464"
+}