Revert "Revert "Telephony light grey list clean up for Q""

This reverts commit bab59cb9db0fe98550d12f03e210e3bc0efc775d.

Reason for revert: Put maxTargetSdk=P now will move APIs onto light greylist
because per-SDK versioned dark greylist is not yet supported by ART. We can
keep doing annotation work without breaking existing apps targeting on P.

Bug:117934933
Bug:112477300

Change-Id: I5e0e693dde49fac3044cd73fd6360c4485f312ec
Merged-in: I5e0e693dde49fac3044cd73fd6360c4485f312ec
diff --git a/telecomm/java/android/telecom/TelecomManager.java b/telecomm/java/android/telecom/TelecomManager.java
index d33a537..3127b35 100644
--- a/telecomm/java/android/telecom/TelecomManager.java
+++ b/telecomm/java/android/telecom/TelecomManager.java
@@ -676,7 +676,7 @@
     /**
      * @hide
      */
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
     public static TelecomManager from(Context context) {
         return (TelecomManager) context.getSystemService(Context.TELECOM_SERVICE);
     }