usb: replace wait_ms() with mdelay()

Common code has a mdelay() func, so use that instead of the usb-specific
wait_ms() func.  This also fixes the build errors:

ohci-hcd.c: In function 'submit_common_msg':
/usr/local/src/u-boot/blackfin/include/usb.h:202:44: sorry, unimplemented: inlining failed in call to 'wait_ms': function body not available
ohci-hcd.c:1519:9: sorry, unimplemented: called from here
/usr/local/src/u-boot/blackfin/include/usb.h:202:44: sorry, unimplemented: inlining failed in call to 'wait_ms': function body not available
ohci-hcd.c:1816:10: sorry, unimplemented: called from here
/usr/local/src/u-boot/blackfin/include/usb.h:202:44: sorry, unimplemented: inlining failed in call to 'wait_ms': function body not available
ohci-hcd.c:1827:10: sorry, unimplemented: called from here
/usr/local/src/u-boot/blackfin/include/usb.h:202:44: sorry, unimplemented: inlining failed in call to 'wait_ms': function body not available
ohci-hcd.c:1844:10: sorry, unimplemented: called from here
/usr/local/src/u-boot/blackfin/include/usb.h:202:44: sorry, unimplemented: inlining failed in call to 'wait_ms': function body not available
ohci-hcd.c:1563:11: sorry, unimplemented: called from here
/usr/local/src/u-boot/blackfin/include/usb.h:202:44: sorry, unimplemented: inlining failed in call to 'wait_ms': function body not available
ohci-hcd.c:1583:9: sorry, unimplemented: called from here
make[1]: *** [ohci-hcd.o] Error 1

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index d6fee81..ef5afc2 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -776,7 +776,7 @@
 		goto unknown;
 	}
 
-	wait_ms(1);
+	mdelay(1);
 	len = min3(srclen, le16_to_cpu(req->length), length);
 	if (srcptr != NULL && len > 0)
 		memcpy(buffer, srcptr, len);
@@ -857,7 +857,7 @@
 	ehci_writel(&hcor->or_configflag, cmd);
 	/* unblock posted write */
 	cmd = ehci_readl(&hcor->or_usbcmd);
-	wait_ms(5);
+	mdelay(5);
 	reg = HC_VERSION(ehci_readl(&hccr->cr_capbase));
 	printf("USB EHCI %x.%02x\n", reg >> 8, reg & 0xff);