Wifi: Add sepolicy files for wifi_ext service

This commit adds the sepolicy related files for wifi_ext service.

Bug: 171944352
Bug: 177966433
Bug: 177673356
Test: Manual
Change-Id: I1613e396fd4c904ed563dfd533fb4b8f807f9657

tracking_denials/hal_wifi_ext.te

@@ -1,4 +0,0 @@
-# b/177966433
-dontaudit hal_wifi_ext vendor_default_prop:property_service { set };
-dontaudit hal_wifi_ext grilservice_app:binder { call };
-dontaudit hal_wifi_ext grilservice_app:binder { call };

whitechapel/vendor/google/hal_wifi_ext.te

@@ -0,0 +1,5 @@
+# Allow wifi_ext to report callbacks to gril-service app
+binder_call(hal_wifi_ext, grilservice_app)
+
+# Write wlan driver/fw version into property
+set_prop(hal_wifi_ext, vendor_wifi_version)

whitechapel/vendor/google/property.te

@@ -32,3 +32,6 @@ vendor_internal_prop(vendor_battery_defender_prop)
 
 # NFC
 vendor_internal_prop(vendor_nfc_prop)
+
+# WiFi
+vendor_internal_prop(vendor_wifi_version)

whitechapel/vendor/google/property_contexts

@@ -87,3 +87,7 @@ persist.vendor.nfc.                             u:object_r:vendor_nfc_prop:s0
 
 # Battery
 vendor.battery.defender.                        u:object_r:vendor_battery_defender_prop:s0
+
+# WiFi
+vendor.wlan.driver.version                      u:object_r:vendor_wifi_version:s0
+vendor.wlan.firmware.version                    u:object_r:vendor_wifi_version:s0