colibri_imx6: migrate usb to using driver model

Migrate USB to using driver model.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
diff --git a/board/toradex/colibri_imx6/colibri_imx6.c b/board/toradex/colibri_imx6/colibri_imx6.c
index 1238474..aaffcf5 100644
--- a/board/toradex/colibri_imx6/colibri_imx6.c
+++ b/board/toradex/colibri_imx6/colibri_imx6.c
@@ -289,28 +289,7 @@
 	imx_iomux_v3_setup_multiple_pads(usb_pads, ARRAY_SIZE(usb_pads));
 	return 0;
 }
-
-int board_ehci_power(int port, int on)
-{
-	switch (port) {
-	case 0:
-		/* control OTG power */
-		/* No special PE for USBC, always on when ID pin signals
-		   host mode */
-		break;
-	case 1:
-		/* Control MXM USBH */
-		/* Set MXM USBH power enable, '0' means on */
-		gpio_request(GPIO_USBH_EN, "USBH_EN");
-		gpio_direction_output(GPIO_USBH_EN, !on);
-		mdelay(100);
-		break;
-	default:
-		break;
-	}
-	return 0;
-}
-#endif /* CONFIG_USB_EHCI_MX6 */
+#endif
 
 #if defined(CONFIG_FSL_ESDHC) && defined(CONFIG_SPL_BUILD)
 /* use the following sequence: eMMC, MMC */