Add RESOLVER_PARAMS_RETRY_COUNT for configuring the retries.

Test: built / flashed / booted
      netd_unit_test, netd_integration_test, libnetd_resolv_test

Change-Id: I68db331b3c8ad8e43696816642f4d5941138c8bc
diff --git a/resolv/include/netd_resolv/params.h b/resolv/include/netd_resolv/params.h
index 939bfc4..c565753 100644
--- a/resolv/include/netd_resolv/params.h
+++ b/resolv/include/netd_resolv/params.h
@@ -34,6 +34,7 @@
     uint8_t min_samples;        // min # samples needed for statistics to be considered meaningful
     uint8_t max_samples;        // max # samples taken into account for statistics
     int base_timeout_msec;      // base query retry timeout (if 0, use RES_TIMEOUT)
+    int retry_count;            // number of retries
 };
 
 // The DNS over TLS mode on a specific netId.