wpa_supplicant(overlay): Increase max bss count

Qcom's driver can support a max of 512 scan results. Ensure that
wpa_supplicant is in sync with that number.

Bug: 74724482
Test: Device boots up and connects to wifi networks.
Change-Id: I62dbd2bd3789c454e9683320d3a58f67019ea7ee
diff --git a/wpa_supplicant_overlay.conf b/wpa_supplicant_overlay.conf
index e1f530d..bb1906c 100644
--- a/wpa_supplicant_overlay.conf
+++ b/wpa_supplicant_overlay.conf
@@ -1,3 +1,4 @@
 disable_scan_offload=1
 p2p_disabled=1
 tdls_external_control=1
+bss_max_count=512