Allow usage of SdkLevel in telephony

This is necessary for TelephonyNetworkFactory because it uses
the static lib NetworkFactory which needs to test where it runs.

CP of ag/14309298

Bug: 183902758
Test: ClientModeImplTest
      OemWifiNetworkFactoryTest
      TelephonyNetworkFactoryTest
      UntrustedWifiNetworkFactoryTest
      WifiNetworkFactoryTest
Change-Id: I765bcb17901a2c9862d5879d524cbf522b6c7526
Merged-In: I765bcb17901a2c9862d5879d524cbf522b6c7526
diff --git a/Android.bp b/Android.bp
index 14f85ad..9aa92f9 100644
--- a/Android.bp
+++ b/Android.bp
@@ -120,6 +120,7 @@
         "PlatformProperties",
         "net-utils-framework-common",
         "telephony-protos",
+        "modules-utils-build_system",
     ],
 
     product_variables: {