Revert "keystore: Allow network_stack uid to use AID_WIFI"

This reverts commit 286c4b053266d77f94fda03320fd2c93ceb20125.

Reason for revert: Wifi services no longer plan to be a separate
APK/process for mainline. Will instead become a jar loaded from Apex.

Bug: 144722612
Change-Id: Ie6c8265f36cd358a87e88e293158df01d262d8cc
Test: Device boots up & connects to wifi networks
diff --git a/keystore/permissions.cpp b/keystore/permissions.cpp
index 9630c31..d17fcdd 100644
--- a/keystore/permissions.cpp
+++ b/keystore/permissions.cpp
@@ -55,12 +55,7 @@
 };
 
 user_euid user_euids[] = {{AID_VPN, AID_SYSTEM},
-                          // Wifi services will run in system_server on devices not using wifi
-                          // mainline module.
                           {AID_WIFI, AID_SYSTEM},
-                          // Wifi services will run in network_stack on devices using wifi mainline
-                          // module.
-                          {AID_WIFI, AID_NETWORK_STACK},
                           {AID_ROOT, AID_SYSTEM},
                           {AID_WIFI, AID_KEYSTORE},
                           {AID_KEYSTORE, AID_WIFI},