graphics: add composer 2.2 default impl

This adds

  android.hardware.graphics.composer@2.2-hal
  android.hardware.graphics.composer@2.2-passthrough
  android.hardware.graphics.composer@2.2-service

The -hal module makes it easier to write composer 2.2 HAL and is
reusable by vendors.  The -passthrough module provides a HwcHal
class that implements ComposerHal 2.2 on top of hwcomposer2, and is
also resuable by vendors.  Finally, the -service module provides a
(stub) default implementation.

Test: boots and VTS
Change-Id: I4f940a9dea656abc7d9d485bf48d852c13d2ed56
diff --git a/graphics/composer/2.2/default/OWNERS b/graphics/composer/2.2/default/OWNERS
new file mode 100644
index 0000000..4714be2
--- /dev/null
+++ b/graphics/composer/2.2/default/OWNERS
@@ -0,0 +1,5 @@
+# Graphics team
+courtneygo@google.com
+jessehall@google.com
+olv@google.com
+stoza@google.com