sb/amd/sb800: Remove bit shift that does nothing

This bit shift attempts to set bits 8 and 9 of the byte variable (counting
from 0). However, as the name suggests, this variable is only 8 bits
wide, so the shift does nothing. Reading section 7.5 of the
AMD SB800-Series Southbridges Register Programming Requirements manual,
bits 8 and 9 are already set by default, so we can remove the bit shift.
(Alternatively, we could try setting the corresponding bits one byte
higher in 0xF1 if needed.)

Change-Id: I645236441e02925ee01339378d213cb343027363
Signed-off-by: Jacob Garber <jgarber1@ualberta.ca>
Found-by: Coverity CID 1229582
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34395
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/southbridge/amd/sb800/usb.c

@@ -42,7 +42,6 @@ static void usb_init(struct device *dev)
 	/* RPR 7.4 Enable the USB controller to get reset by any software that generate a PCIRst# condition */
 	byte = pm_ioread(0xF0);
 	byte |= (1 << 2);
-	byte |= 3 << 8;		/* rpr 7.5 */
 	pm_iowrite(0xF0, byte);
 
 	/* RPR 7.9 Disable OHCI MSI Capability. */