nb/intel/haswell/haswell.h: Do not include pch.h

Avoid indirect header inclusion, include `pch.h` where necessary.

Change-Id: I6b72976a28ffaad68bcf558c8a13b5c221070522
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49944
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/northbridge/intel/haswell/gma.c

@@ -15,6 +15,7 @@
 #include <drivers/intel/gma/libgfxinit.h>
 #include <cpu/intel/haswell/haswell.h>
 #include <drivers/intel/gma/opregion.h>
+#include <southbridge/intel/lynxpoint/pch.h>
 #include <string.h>
 #include <types.h>