Add supported_on to Phone Hub enterprise policy

Bug: 1106937
Change-Id: Ie4f3bf85e2dbddd232d4746e730a1e942f2587c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626604Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Claude van der Merwe <cvandermerwe@google.com>
Cr-Commit-Position: refs/heads/master@{#843671}

components/policy/resources/policy_templates.json

@@ -16681,7 +16681,7 @@
       'owners': ['khorimoto@google.com', 'vecore@chromium.org', 'better-together-dev@google.com'],
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'future_on': ['chrome_os'],
+      'supported_on': ['chrome_os:89-'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
@@ -16702,7 +16702,7 @@
       'owners': ['khorimoto@google.com', 'vecore@chromium.org', 'better-together-dev@google.com'],
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'future_on': ['chrome_os'],
+      'supported_on': ['chrome_os:89-'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,
@@ -16722,7 +16722,7 @@
       'owners': ['khorimoto@google.com', 'vecore@chromium.org', 'better-together-dev@google.com'],
       'type': 'main',
       'schema': { 'type': 'boolean' },
-      'future_on': ['chrome_os'],
+      'supported_on': ['chrome_os:89-'],
       'features': {
         'dynamic_refresh': True,
         'per_profile': True,