lakitu, lakitu-arm64: Add virtual/target-os

We want project-lakitu to be a library overlay, and not a board overlay
(i.e. it cannot be used to create images). To this end, we want to
remove virtual/target-os from project-lakitu, and define this package in
all board overlays.

To accomplish this, we first define virtual/target-os in all board
overlays. Then we will remove virtual/target-os from project-lakitu.
This change defines virtual/target-os for lakitu and lakitu-arm64.

BUG=b/173144094
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I5930edb51746d02aace49164cdd096a35aedc614
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/9961
Reviewed-by: Edward Jee <edjee@google.com>
Reviewed-by: Roy Yang <royyang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
diff --git a/overlay-lakitu-arm64/virtual/target-os/target-os-2-r1.ebuild b/overlay-lakitu-arm64/virtual/target-os/target-os-2-r1.ebuild
new file mode 120000
index 0000000..42a14b1
--- /dev/null
+++ b/overlay-lakitu-arm64/virtual/target-os/target-os-2-r1.ebuild
@@ -0,0 +1 @@
+target-os-2.ebuild
\ No newline at end of file
diff --git a/overlay-lakitu-arm64/virtual/target-os/target-os-2.ebuild b/overlay-lakitu-arm64/virtual/target-os/target-os-2.ebuild
new file mode 100644
index 0000000..1c2ffe9
--- /dev/null
+++ b/overlay-lakitu-arm64/virtual/target-os/target-os-2.ebuild
@@ -0,0 +1,27 @@
+#
+# Copyright 2020 Google LLC
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# version 2 as published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+
+EAPI=7
+
+DESCRIPTION="List of packages that make up the base image"
+HOMEPAGE="https://cos.googlesource.com"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="*"
+IUSE=""
+
+RDEPEND="
+	virtual/target-lakitu
+	virtual/target-lakitu-gcp
+"
diff --git a/overlay-lakitu/virtual/target-os/target-os-2-r1.ebuild b/overlay-lakitu/virtual/target-os/target-os-2-r1.ebuild
new file mode 120000
index 0000000..42a14b1
--- /dev/null
+++ b/overlay-lakitu/virtual/target-os/target-os-2-r1.ebuild
@@ -0,0 +1 @@
+target-os-2.ebuild
\ No newline at end of file
diff --git a/overlay-lakitu/virtual/target-os/target-os-2.ebuild b/overlay-lakitu/virtual/target-os/target-os-2.ebuild
new file mode 100644
index 0000000..1c2ffe9
--- /dev/null
+++ b/overlay-lakitu/virtual/target-os/target-os-2.ebuild
@@ -0,0 +1,27 @@
+#
+# Copyright 2020 Google LLC
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# version 2 as published by the Free Software Foundation.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+
+EAPI=7
+
+DESCRIPTION="List of packages that make up the base image"
+HOMEPAGE="https://cos.googlesource.com"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="*"
+IUSE=""
+
+RDEPEND="
+	virtual/target-lakitu
+	virtual/target-lakitu-gcp
+"