Hide NanoAppMessage setters

This CL hides NanoAppMessage setters from the public API.

Bug: 328120618
Test: Presubmits
Change-Id: I05e9f03e90f1bb1c5c590567de76024643b37570
diff --git a/core/api/system-current.txt b/core/api/system-current.txt
index fb2a4ac..f7d9625 100644
--- a/core/api/system-current.txt
+++ b/core/api/system-current.txt
@@ -6203,8 +6203,6 @@
     method public long getNanoAppId();
     method public boolean isBroadcastMessage();
     method @FlaggedApi("android.chre.flags.reliable_message") public boolean isReliable();
-    method @FlaggedApi("android.chre.flags.reliable_message") public void setIsReliable(boolean);
-    method @FlaggedApi("android.chre.flags.reliable_message") public void setMessageSequenceNumber(int);
     method public void writeToParcel(android.os.Parcel, int);
     field @NonNull public static final android.os.Parcelable.Creator<android.hardware.location.NanoAppMessage> CREATOR;
   }
diff --git a/core/java/android/hardware/location/NanoAppMessage.java b/core/java/android/hardware/location/NanoAppMessage.java
index 48aa1bd..905caf0 100644
--- a/core/java/android/hardware/location/NanoAppMessage.java
+++ b/core/java/android/hardware/location/NanoAppMessage.java
@@ -164,16 +164,18 @@
 
     /**
      * Sets the isReliable field of the message
+     *
+     * @hide
      */
-    @FlaggedApi(Flags.FLAG_RELIABLE_MESSAGE)
     public void setIsReliable(boolean isReliable) {
         mIsReliable = isReliable;
     }
 
     /**
      * Sets the message sequence number of the message
+     *
+     * @hide
      */
-    @FlaggedApi(Flags.FLAG_RELIABLE_MESSAGE)
     public void setMessageSequenceNumber(int messageSequenceNumber) {
         mMessageSequenceNumber = messageSequenceNumber;
     }