dm: scsi: Add a generic PCI-based AHCI driver

This adds support for PCI-based AHCI controller based on DM SCSI.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 6427f1b..db05160 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -40,6 +40,12 @@
 
 menu "SATA/SCSI device support"
 
+config AHCI_PCI
+	bool "Support for PCI-based AHCI controller"
+	depends on DM_SCSI
+	help
+	  Enables support for the PCI-based AHCI controller.
+
 config SATA_CEVA
 	bool "Ceva Sata controller"
 	depends on AHCI