sm8450-common: Build WiFi hal from source

Change-Id: I31ad65417cfcd1bff81f8686e319c627634e992f

wlan/p2p_supplicant_overlay.conf

@@ -0,0 +1,7 @@
+disable_scan_offload=1
+p2p_no_group_iface=1
+persistent_reconnect=1
+bss_max_count=400
+p2p_go_ht40=1
+p2p_go_vht=1
+p2p_go_he=1