Wifi 1.3: Fix STA getFactoryMacAddress test.

It's valid for individual bytes in a MAC address to be zero as long as
they're not all zero.

Bug: 132705022
Bug: 141916952
Test: m -j32 vts && vts-tradefed run vts-hal --skip-preconditions --module VtsHalWifiV1_3Target
Change-Id: Ic33a3b80cce90eb4b031aca33aa66bf2a375dc16