overlay profiles: Add FLATCAR_{TYPE,SUBTYPE} variables

Author: krnowak

sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/dev/make.defaults

@@ -1,6 +1,8 @@
 # Copyright (c) 2014 The CoreOS Authors. All rights reserved.
 # Distributed under the terms of the GNU General Public License v2
 
+FLATCAR_SUBTYPE="dev"
+
 # full debug info is way to big to fit into our 1GB /usr partitions.
 INSTALL_MASK="${INSTALL_MASK}
     /usr/lib/debug

sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/make.defaults

@@ -1,6 +1,8 @@
 # Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
 # Distributed under the terms of the GNU General Public License v2
 
+FLATCAR_TYPE="generic"
+
 USE="acpi usb cryptsetup policykit"
 USE="${USE} -cros_host -expat -cairo -X -man"
 USE="${USE} -acl -gpm -python"

sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/generic/prod/make.defaults

@@ -1,6 +1,8 @@
 # Copyright (c) 2014 The CoreOS Authors. All rights reserved.
 # Distributed under the terms of the GNU General Public License v2
 
+FLATCAR_SUBTYPE="prod"
+
 # Restrictive mask for production images.
 INSTALL_MASK="${INSTALL_MASK}
   *.a *.la *.hpp *.o

sdk_container/src/third_party/coreos-overlay/profiles/coreos/targets/sdk/make.defaults

@@ -1,3 +1,5 @@
+FLATCAR_TYPE="sdk"
+
 USE="cros_host expat man -pam"
 
 # Used by some old goo in profiles/coreos/base/profile.bashrc