Unbreak testStartUsingNetworkFeature_enableHipri failure

aosp/1261619 break legacy API that only supported for SDK which is
smaller than android M, caller need to have network stack permission
to request network with legacy type. Fix failure by whitelist permission
check for the caller who built with oder SDK(< M).

Bug: 152229492
Test: atest CtsTetheringTest
      atest ConnectivityManagerLegacyTest# \
      testStartUsingNetworkFeature_enableHipri

Change-Id: I367dff0429f26f266282300edc38637b55eece38