Fix vts test VtsHalWifiV1_2TargetTest

VTS test for WifiChipHidlTest#registerEventCallback_1_2 was failing
on the default implementation of the 1.4 HAL. This is because
registerEventCallback_1_2() is no longer supported due to the upgrade
to registerEventCallback_1_4().

This commit fixes this VTS test error by allowing ERROR_NOT_SUPPORTED
as a valid test output.

Bug: 146020950
Test: atest VtsHalWifiV1_2TargetTest

Change-Id: Ia58b0dad5ed753c22d620b0fad6904d634e01e72