chromeos mainboards: remove chromeos.asl

Use the ACPI generator for creating the Chrome OS gpio
package. Each mainboard has its own list of Chrome OS
gpios that are fed into a helper to generate the ACPI
external OIPG package.  Additionally, the common
chromeos.asl is now conditionally included based on
CONFIG_CHROMEOS.

Change-Id: I1d3d951964374a9d43521879d4c265fa513920d2
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/15909
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>

src/vendorcode/google/chromeos/acpi.c

@@ -0,0 +1,43 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2016 Google Inc.
+ *
+ * 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.
+ */
+
+#include <arch/acpigen.h>
+#include "chromeos.h"
+
+void chromeos_acpi_gpio_generate(const struct cros_gpio *gpios, size_t num)
+{
+	size_t i;
+
+	acpigen_write_scope("\\");
+	acpigen_write_name("OIPG");
+
+	acpigen_write_package(num);
+	for (i = 0; i < num; i++) {
+		acpigen_write_package(4);
+		acpigen_write_integer(gpios[i].type);
+		acpigen_write_integer(gpios[i].polarity);
+		acpigen_write_integer(gpios[i].gpio_num);
+		acpigen_write_string(gpios[i].device);
+		acpigen_pop_len();
+	}
+	acpigen_pop_len();
+
+	acpigen_pop_len();
+}
+
+void chromeos_dsdt_generator(struct device *dev)
+{
+	mainboard_chromeos_acpi_generate();
+}