Reland "Enable ipcz by default on brya"

This is a reland of commit f07748b914359cc116a1342ffe7d23a282b3434e

With the merge of https://crrev.com/c/6865658 this is now safe

Original change's description:
> Enable ipcz by default on brya
>
> After successful 100% stable rollout on Grunt.
>
> Design doc: http://go/ipcz-chromeos
>
> Test: Ran all xTS tests to verify correct functioning of ARCVM. Ran all
> critical tast tests to verify correct functioning of ChromeOS.
> Bug: 41494930
>
> Disallow-Recycled-Builds: all
> Force-Relevant-Builds: brya-cq
> Change-Id: Iab48cbf0395aab04ccf3abc119ffe13a9ba4b065
> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/board-overlays/+/6847282
> Reviewed-by: Bhanu Prakash Maiya <bhanumaiya@google.com>
> Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
> Commit-Queue: Andrea Orru <andreaorru@chromium.org>
> Reviewed-by: Brian Geffon <bgeffon@chromium.org>
> Tested-by: Andrea Orru <andreaorru@chromium.org>

Bug: 41494930

Disallow-Recycled-Builds: all
Force-Relevant-Builds: brya-cq
Change-Id: I7373b5ce517ae0d4d0522fa749ada456f18374e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/board-overlays/+/6897447
Reviewed-by: Kazuhiro Inaba <kinaba@chromium.org>
Tested-by: Andrea Orru <andreaorru@chromium.org>
Reviewed-by: Bhanu Prakash Maiya <bhanumaiya@google.com>
Commit-Queue: Andrea Orru <andreaorru@chromium.org>
diff --git a/overlay-brya/profiles/base/make.defaults b/overlay-brya/profiles/base/make.defaults
index 73e798a..0b9bb35 100644
--- a/overlay-brya/profiles/base/make.defaults
+++ b/overlay-brya/profiles/base/make.defaults
@@ -104,3 +104,6 @@
 
 # Use cros-camera-algo service
 USE="${USE} cros_camera_algo"
+
+# Enable ipcz by default
+USE="${USE} ipcz"