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/board/mpl/common/usb_uhci.c b/board/mpl/common/usb_uhci.c
index 89d2e0a..ddca587 100644
--- a/board/mpl/common/usb_uhci.c
+++ b/board/mpl/common/usb_uhci.c
@@ -435,9 +435,9 @@
 	out16r( usb_base_addr + USBCMD,USBCMD_GRESET | USBCMD_RS);
 	/* Turn off all interrupts */
 	out16r(usb_base_addr + USBINTR,0);
-	wait_ms(50);
+	mdelay(50);
 	out16r( usb_base_addr + USBCMD,0);
-	wait_ms(10);
+	mdelay(10);
 }
 
 void start_hc(void)
@@ -926,13 +926,13 @@
 			status = in16r(usb_base_addr+USBPORTSC1+2*(wIndex-1));
 			status = (status & 0xfff5) | USBPORTSC_PR;
 			out16r(usb_base_addr+USBPORTSC1+2*(wIndex-1),status);
-			wait_ms(10);
+			mdelay(10);
 			status = (status & 0xfff5) & ~USBPORTSC_PR;
 			out16r(usb_base_addr+USBPORTSC1+2*(wIndex-1),status);
 			udelay(10);
 			status = (status & 0xfff5) | USBPORTSC_PE;
 			out16r(usb_base_addr+USBPORTSC1+2*(wIndex-1),status);
-			wait_ms(10);
+			mdelay(10);
 			status = (status & 0xfff5) | 0xa;
 			out16r(usb_base_addr+USBPORTSC1+2*(wIndex-1),status);
 			len=0;