base_system.mk: Switch back to InProcessWifiStack

Until we fix the RAM usage increase with the out of process version, use
the system_server version.

Bug: 140564146
Test: Device boots up and connects to wifi networks.
Change-Id: I8ebfba7e2ce8fcb7383ce05336dbc0ae7d7a2947
diff --git a/target/product/base_system.mk b/target/product/base_system.mk
index 2edde02..508a208 100644
--- a/target/product/base_system.mk
+++ b/target/product/base_system.mk
@@ -266,7 +266,7 @@
     vold \
     WallpaperBackup \
     watchdogd \
-    WifiStack \
+    InProcessWifiStack \
     wificond \
     wm \