ARM: mmp: add usb device support for PXA910

Add usb device support for Marvell PXA910.
Actually PXA920 will use the same device.

Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
diff --git a/arch/arm/mach-mmp/Kconfig b/arch/arm/mach-mmp/Kconfig
index 5a90b9a..fa03974 100644
--- a/arch/arm/mach-mmp/Kconfig
+++ b/arch/arm/mach-mmp/Kconfig
@@ -113,4 +113,11 @@
 	select CPU_PJ4
 	help
 	  Select code specific to MMP2. MMP2 is ARMv7 compatible.
+
+config USB_EHCI_MV_U2O
+        bool "EHCI support for PXA USB OTG controller"
+	depends on USB_EHCI_MV
+	help
+	  Enables support for OTG controller which can be switched to host mode.
+
 endif