wpa_supplicant(interface): Add iface/network type

Add separate types of Iface/Network object for STA (station mode) and
P2P mode ifaces and associated networks. These expose very different
functionality and exposing 2 different types of objects makes the
interface cleaner.
Although, they're still represented via the same struct for both types
in the wpa_supplicant core.

Bug: 32553421
Test: ./hardware/interfaces/update-makefiles.sh
Change-Id: I41601a650709429c65014cb7adaf6cb9ab03787e