Enable ipcz by default on all boards

After successful 100% stable rollout on Grunt and Brya.

Design doc: http://go/ipcz-chromeos

BUG=chromium:41494930
TEST=CQ

Disallow-Recycled-Builds: all
Force-Relevant-Builds: all
Change-Id: If20c4eaaabc6237aa95b6aa376b13c9aaac19625
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/7095288
Reviewed-by: Brian Geffon <bgeffon@chromium.org>
Tested-by: Andrea Orru <andreaorru@chromium.org>
Commit-Queue: Andrea Orru <andreaorru@chromium.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
diff --git a/profiles/targets/chromeos/make.defaults b/profiles/targets/chromeos/make.defaults
index aa30394..04f67ca 100644
--- a/profiles/targets/chromeos/make.defaults
+++ b/profiles/targets/chromeos/make.defaults
@@ -186,6 +186,9 @@
 # Enable the regmon daemon
 USE="${USE} regmon"
 
+# Enable ipcz by default.
+USE="${USE} ipcz"
+
 # Disable tty2 console.
 TTY_CONSOLE="-tty2"