InProcessNetworkStack requires platform-signed APK

PlatformCaptivePortalLogin must be used with InProcessNetworkStack
instead of CaptivePortalLogin, since the signature of the APKs must
match.

Bug: 132666298
Test: Flashed walleye_svelte-eng, networking and captive portal working,
      including "use as-is".

Change-Id: I243b29f2397b22f0d55af0d8927e75916d644198
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 7c21875..f311fc8 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -252,6 +252,7 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/media/audio)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/DynamicAndroidInstallationService)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/DefaultContainerService)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/CaptivePortalLogin)
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER
 # ******************************************************************