Fix typo in the IS_OMPT_VOICEMAIL field.

This cause the voicemail content provider to crash on query.

Bug: 34610526
Change-Id: I561ae6616fe66ea49630fa6c4eb9280fdc24b153
Fixes: 34610526
Test: VoicemailContentProviderTest
(cherry picked from commit 57365441d41ab914ef3e19044ec537bfb64d442c)
diff --git a/core/java/android/provider/VoicemailContract.java b/core/java/android/provider/VoicemailContract.java
index a4b6807..e48a0d0 100644
--- a/core/java/android/provider/VoicemailContract.java
+++ b/core/java/android/provider/VoicemailContract.java
@@ -319,7 +319,7 @@
          *
          * @hide
          */
-        public static final String IS_OMTP_VOICEMAIL = "is_omtp_voicmail";
+        public static final String IS_OMTP_VOICEMAIL = "is_omtp_voicemail";
 
         /**
          * A convenience method to build voicemail URI specific to a source package by appending