mb/hp/snb_ivb_desktops: Remove unused includes

There are several unused includes here.

TEST=Built 8200 usdt with BUILD_TIMELESS=1, no change in output ROM.

Change-Id: Ib4082a2589441b1d257db622380733e2825b27c2
Signed-off-by: Riku Viitanen <riku.viitanen@protonmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85815
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

src/mainboard/hp/snb_ivb_desktops/mainboard.c

@@ -2,7 +2,6 @@
 
 #include <device/device.h>
 #include <drivers/intel/gma/int15.h>
-#include <southbridge/intel/bd82x6x/pch.h>
 #include <smbios.h>
 
 #if CONFIG(GENERATE_SMBIOS_TABLES)

src/mainboard/hp/snb_ivb_desktops/variants/compaq_8200_elite_sff/early_init.c

@@ -3,7 +3,6 @@
 #include <bootblock_common.h>
 #include <superio/nuvoton/npcd378/npcd378.h>
 #include <superio/nuvoton/common/nuvoton.h>
-#include <southbridge/intel/bd82x6x/pch.h>
 
 #define SERIAL_DEV PNP_DEV(0x2e, NPCD378_SP2)
 

src/mainboard/hp/snb_ivb_desktops/variants/compaq_8200_elite_usdt/early_init.c

@@ -3,7 +3,6 @@
 #include <bootblock_common.h>
 #include <superio/nuvoton/npcd378/npcd378.h>
 #include <superio/nuvoton/common/nuvoton.h>
-#include <southbridge/intel/bd82x6x/pch.h>
 
 #define SERIAL_DEV PNP_DEV(0x2e, NPCD378_SP2)
 

src/mainboard/hp/snb_ivb_desktops/variants/compaq_8300_elite_sff/early_init.c

@@ -3,7 +3,6 @@
 #include <bootblock_common.h>
 #include <superio/nuvoton/npcd378/npcd378.h>
 #include <superio/nuvoton/common/nuvoton.h>
-#include <southbridge/intel/bd82x6x/pch.h>
 
 #define SERIAL_DEV PNP_DEV(0x2e, NPCD378_SP2)
 

src/mainboard/hp/snb_ivb_desktops/variants/compaq_elite_8300_usdt/early_init.c

@@ -1,8 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 
 #include <bootblock_common.h>
-#include <superio/nuvoton/npcd378/npcd378.h>
-#include <superio/nuvoton/common/nuvoton.h>
 #include <device/pci_ops.h>
 
 void bootblock_mainboard_early_init(void)