ide cmd64x: Remove serialize setting.

This begins to fix regressions reported by Frans Pop on his Ultra-10.

There are still some funnies left that we are investigating.
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ide/cmd64x.c

@@ -389,8 +389,7 @@ static const struct ide_port_info cmd64x_chipsets[] __devinitdata = {
 		.init_chipset	= init_chipset_cmd64x,
 		.enablebits	= {{0x51,0x04,0x04}, {0x51,0x08,0x08}},
 		.port_ops	= &cmd648_port_ops,
-		.host_flags	= IDE_HFLAG_SERIALIZE |
-				  IDE_HFLAG_ABUSE_PREFETCH,
+		.host_flags	= IDE_HFLAG_ABUSE_PREFETCH,
 		.pio_mask	= ATA_PIO5,
 		.mwdma_mask	= ATA_MWDMA2,
 		.udma_mask	= ATA_UDMA2,