acloud: Handle instance_type and flavor in AVDSpec.

Bug: 112393962
Test: m acloud && acloud create
Change-Id: I9b64cbafc4efb3c724731c762f24c361c9afd08e
diff --git a/internal/constants.py b/internal/constants.py
index 7367ef2..8b328cc 100755
--- a/internal/constants.py
+++ b/internal/constants.py
@@ -33,4 +33,21 @@
 TYPE_CF = "cuttlefish"
 TYPE_GF = "goldfish"
 
+# Instance types
+INSTANCE_TYPE_REMOTE = "remote"
+INSTANCE_TYPE_LOCAL = "local"
+
+# Flavor types
+FLAVOR_PHONE = "phone"
+FLAVOR_AUTO = "auto"
+FLAVOR_WEAR = "wear"
+FLAVOR_TV = "tv"
+FLAVOR_IOT = "iot"
+FLAVOR_TABLET = "tablet"
+FLAVOR_TABLET_3G = "tablet_3g"
+ALL_FLAVORS = [
+    FLAVOR_PHONE, FLAVOR_AUTO, FLAVOR_WEAR, FLAVOR_TV, FLAVOR_IOT,
+    FLAVOR_TABLET, FLAVOR_TABLET_3G
+]
+
 USER_ANSWER_YES = {"y", "yes", "Y"}