sb/lynxpoint: Fix 'dead increment'

Dead increment spotted out using clang-tools.

Change-Id: I631524b9346647048fe8ea30387553a5b4651f59
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36129
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/southbridge/intel/lynxpoint/lpc.c

@@ -403,7 +403,7 @@ static void enable_hpet(struct device *const dev)
 	reg32 &= ~(3 << 0);
 	RCBA32(HPTC) = reg32;
 	/* Read it back to stick. It's affected by posted write syndrome. */
-	reg32 = RCBA32(HPTC);
+	RCBA32(HPTC);
 }
 
 static void enable_clock_gating(struct device *dev)

src/southbridge/intel/lynxpoint/sata.c

@@ -144,7 +144,7 @@ static void sata_init(struct device *dev)
 
 		/* 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 */