wpa_supplicant: Allow permissions for socket operations to modem.

wpa_supplicant's eap_proxy needs interaction with SIM ( Modem ) for
EAP-SIM / AKA operation. Hence add the the requisite permissions for
the socket interactions.

CRs-Fixed: 2090834
Change-Id: Ib733cf27709b0f47e68199ad9402aa75cbd0bbe7