mb/packardbell/ms2290: Correct header included

It uses ibexpeak southbridge and should include its pch.h,
not bd82x6x's.

TEST=Timeless binary did not change.

Change-Id: Iafa83b7f3c1cd2d8ab9af51aa331ca673d9a66df
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/81888
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/mainboard/packardbell/ms2290/mainboard.c

@@ -2,7 +2,7 @@
 
 #include <device/device.h>
 #include <northbridge/intel/ironlake/ironlake.h>
-#include <southbridge/intel/bd82x6x/pch.h>
+#include <southbridge/intel/ibexpeak/pch.h>
 #include <ec/acpi/ec.h>
 #include <drivers/intel/gma/int15.h>
 #include <pc80/keyboard.h>