soc/intel/broadwell: Fix 'dead increment'

Dead increment spotted out using clang-tools.

Change-Id: Icfab0b9ce97722fe97a0306cb45fbc2bd072bad6
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36130
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/soc/intel/broadwell/sata.c

@@ -75,8 +75,7 @@ static void sata_init(struct device *dev)
 	pci_write_config32(dev, 0x98, reg32);
 
 	/* Setup register 9Ch */
-	reg16 = 0;           /* Disable alternate ID */
-	reg16 = 1 << 5;      /* BWG step 12 */
+	reg16 = (1 << 5);   /* BWG step 12 */
 	pci_write_config16(dev, 0x9c, reg16);
 
 	/* SATA Initialization register */