Add @UnsupportedAppUsage to test apis that are known to be used by apps.

go/testapi-enforcement

Bug: 133832325
Test: m
Change-Id: Ifc8db120640a1554dcbf1722e61e09c7ddc65dd6
Merged-In: Ifc8db120640a1554dcbf1722e61e09c7ddc65dd6
diff --git a/core/java/android/net/NetworkCapabilities.java b/core/java/android/net/NetworkCapabilities.java
index e3259ff..88877e2 100644
--- a/core/java/android/net/NetworkCapabilities.java
+++ b/core/java/android/net/NetworkCapabilities.java
@@ -478,6 +478,7 @@
      * @return an array of capability values for this instance.
      * @hide
      */
+    @UnsupportedAppUsage
     @TestApi
     public @NetCapability int[] getCapabilities() {
         return BitUtils.unpackBits(mNetworkCapabilities);