usb: musb: fix Blackfin DMA register padding

The conversion from offsets to C structs lost a little padding in the DMA
register map.  Accessing endpoints other than ep0 with DMA would fail as
the addresses wouldn't be adjusted correctly.

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

drivers/usb/musb/blackfin_usb.h

@@ -82,7 +82,7 @@ struct bfin_musb_dma_regs {
 	ureg(addr_high);
 	ureg(count_low);
 	ureg(count_high);
-	ureg(pad);
+	u32 reserved0[2];
 };
 
 #undef ureg