Expose internal representation of transport types.

Add getTransportTypesInternal as a hidden api for internal callers. This
will be used for any metrics that need to store the transport types of a
network.

Bug: 273451360
Test: atest FrameworksNetTests
Change-Id: I527638e5408e7971a450135345e7e51b6125d665

framework/src/android/net/NetworkCapabilities.java

@@ -1347,6 +1347,18 @@ public final class NetworkCapabilities implements Parcelable {
         return BitUtils.unpackBits(mTransportTypes);
     }
 
+    /**
+     * Gets the transports as an int. Internal callers only.
+     *
+     * Prefer getTransportTypes/hasTransportType if not immediately collapsing back into a scalar.
+     *
+     * @return a long integer representing the transport types.
+     * @hide
+     */
+    public long getTransportTypesInternal() {
+        return mTransportTypes;
+    }
+
     /**
      * Sets all the transports set on this {@code NetworkCapability} instance.
      * This overwrites any existing transports.