Support QoS Filter protocol

Provide getter for protocol ID included in QoS Filter from network

Bug: 246227644
Test: android build, atest FrameworksTelephonyTests
Change-Id: I2b5813eef1ae19bea757fb781032dd0bac68fb56

telephony/java/android/telephony/data/QosBearerFilter.java

@@ -130,6 +130,10 @@ public final class QosBearerFilter implements Parcelable {
         return precedence;
     }
 
+    public int getProtocol() {
+        return protocol;
+    }
+
     public static class PortRange implements Parcelable {
         int start;
         int end;