adb: add track-devices-l service.

Add a way to get the full `devices -l` output on a continuous basis.

Test: manual
Change-Id: I2270cc0a0d7e1384ce19631724ddf2462d963ade
diff --git a/services.cpp b/services.cpp
index cc840b8..dbf71d3 100644
--- a/services.cpp
+++ b/services.cpp
@@ -441,7 +441,9 @@
 #if ADB_HOST
 asocket* host_service_to_socket(const char* name, const char* serial, TransportId transport_id) {
     if (!strcmp(name,"track-devices")) {
-        return create_device_tracker();
+        return create_device_tracker(false);
+    } else if (!strcmp(name, "track-devices-l")) {
+        return create_device_tracker(true);
     } else if (android::base::StartsWith(name, "wait-for-")) {
         name += strlen("wait-for-");