Add VTS tests for the untested legacy

P2P iface methods.

All of these methods have existed since V1 of
the Supplicant AIDL interface.

Bug: 386810503
Test: atest VtsHalWifiSupplicantP2pIfaceTargetTest
Change-Id: I4df7c4ec203ccb9c9a919e1ec3bee7476b2042bd