soc/intel/skylake: Add ASL entries for IMGU and CIO2 devices

Add ASL entries for IMGU and CIO2 devices

* _CCA ACPI object to report that there is no Cache Coherent DMA support.
* CAMD ACPI object to specify the device type.
These ACPI objects are used by Intel kernel drivers.

BUG=b:36580624
BRANCH=none
TEST=Build and boot poppy. Dump and verify that DSDT table
has the entries for IMGU and CIO2 devices.

Change-Id: I13050253e18408cdb1e196f8003b3f43299aa5a5
Signed-off-by: Sowmya V <v.sowmya@intel.com>
Signed-off-by: Rizwan Qureshi <rizwan.qureshi@intel.com>
Reviewed-on: https://review.coreboot.org/18968
Tested-by: build bot (Jenkins)
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/soc/intel/skylake/acpi/ipu.asl

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ */
+
+/* IPU3 input system - Device 05, Function 0 */
+Device (IMGU)
+{
+	Name (_ADR, 0x00050000)
+	Name (_DDN, "Imaging Unit")
+	Name (_CCA, ZERO)
+	Name (CAMD, 0x01)
+}
+
+/* IPU3 processing system - Device 14, Function 3 */
+Device (CIO2)
+{
+	Name (_ADR, 0x00140003)
+	Name (_DDN, "Camera and Imaging Subsystem")
+	Name (_CCA, ZERO)
+	Name (CAMD, 0x00)
+}