usb: ohci: ohci-da8xx: Enable da850-ohci driver with DM support

This patch reuses some former code for the hawkboard, combines it
with some some similar DM_USB compatible code for the OHCI driver,
and enables the use of the da850's OHCI controller with DM_USB
compatibility.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 1c2212f..b1188bc 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -246,6 +246,11 @@
 	---help---
 	  Enables support for generic OHCI controller.
 
+config USB_OHCI_DA8XX
+	bool "Support for da850 OHCI USB controller"
+	help
+	  Enable support for the da850 USB controller.
+
 endif # USB_OHCI_HCD
 
 config USB_UHCI_HCD