USB: Add EHCI support for MX27 and MX31 based boards

The Freescale MX27 and MX31 SoCs have a EHCI controller onboard.
The controller is capable of USB on the go. This patch adds
a driver to support all three of them.

Users have to pass details about serial interface configuration in the
platform data.

The USB OTG core used here is the ARC core, so the driver should
be renamed and probably be merged with ehci-fsl.c eventually.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/host/ehci-hcd.c

@@ -1105,6 +1105,11 @@ MODULE_LICENSE ("GPL");
 #define	PLATFORM_DRIVER		ehci_fsl_driver
 #endif
 
+#ifdef CONFIG_USB_EHCI_MXC
+#include "ehci-mxc.c"
+#define PLATFORM_DRIVER		ehci_mxc_driver
+#endif
+
 #ifdef CONFIG_SOC_AU1200
 #include "ehci-au1xxx.c"
 #define	PLATFORM_DRIVER		ehci_hcd_au1xxx_driver