Allow yet another combination of key management options

Framework sets allowedKeyManagement to WPA_EAP + WPA_PSK, if
WifiConfiguration didn't supply any value for it. It should probably
change to NONE; but that is post K thing. I am allowing that
combination for now.

Bug: 10843500
Change-Id: Id0c28f4aaf32c6a7e7dca07114a2452ce194a798