dm: sata: dwc_ahsata: Add support for driver model

Update this driver to support driver model. This involves implementing the
AHCI operations and reusing existing common code.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dwc_ahsata.h b/include/dwc_ahsata.h
new file mode 100644
index 0000000..cae275f
--- /dev/null
+++ b/include/dwc_ahsata.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright 2017 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __DWC_AHSATA_H__
+#define __DWC_AHSATA_H__
+
+int dwc_ahsata_bus_reset(struct udevice *dev);
+int dwc_ahsata_probe(struct udevice *dev);
+int dwc_ahsata_scan(struct udevice *dev);
+int dwc_ahsata_port_status(struct udevice *dev, int port);
+
+#endif