treewide: Add 'IWYU pragma: export' comment

This pragma says to IWYU (Include What You Use) that the current file
is supposed to provide commented headers.

Change-Id: I482c645f6b5f955e532ad94def1b2f74f15ca908
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68332
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
diff --git a/src/southbridge/intel/bd82x6x/pch.h b/src/southbridge/intel/bd82x6x/pch.h
index 15d908a..34b36c3 100644
--- a/src/southbridge/intel/bd82x6x/pch.h
+++ b/src/southbridge/intel/bd82x6x/pch.h
@@ -22,7 +22,7 @@
 #define DEFAULT_GPIOBASE	0x0480
 #define DEFAULT_PMBASE		0x0500
 
-#include <southbridge/intel/common/rcba.h>
+#include <southbridge/intel/common/rcba.h> /* IWYU pragma: export */
 
 #if CONFIG(SOUTHBRIDGE_INTEL_BD82X6X)
 #define CROS_GPIO_DEVICE_NAME	"CougarPoint"
diff --git a/src/southbridge/intel/i82801gx/i82801gx.h b/src/southbridge/intel/i82801gx/i82801gx.h
index f2ec1c6..68a32df 100644
--- a/src/southbridge/intel/i82801gx/i82801gx.h
+++ b/src/southbridge/intel/i82801gx/i82801gx.h
@@ -7,7 +7,7 @@
 #define DEFAULT_GPIOBASE	0x0480
 #define DEFAULT_PMBASE		0x0500
 
-#include <southbridge/intel/common/rcba.h>
+#include <southbridge/intel/common/rcba.h> /* IWYU pragma: export */
 
 #ifndef __ACPI__
 #define DEBUG_PERIODIC_SMIS 0
diff --git a/src/southbridge/intel/i82801ix/i82801ix.h b/src/southbridge/intel/i82801ix/i82801ix.h
index 56f14b0..f0b60f6 100644
--- a/src/southbridge/intel/i82801ix/i82801ix.h
+++ b/src/southbridge/intel/i82801ix/i82801ix.h
@@ -5,7 +5,7 @@
 
 #define DEFAULT_TBAR		((u8 *)0xfed1b000)
 
-#include <southbridge/intel/common/rcba.h>
+#include <southbridge/intel/common/rcba.h> /* IWYU pragma: export */
 
 #if CONFIG(BOARD_EMULATION_QEMU_X86_Q35)
 /*
diff --git a/src/southbridge/intel/i82801jx/i82801jx.h b/src/southbridge/intel/i82801jx/i82801jx.h
index 2254689..33386f5 100644
--- a/src/southbridge/intel/i82801jx/i82801jx.h
+++ b/src/southbridge/intel/i82801jx/i82801jx.h
@@ -5,7 +5,7 @@
 
 #define DEFAULT_TBAR		((u8 *)0xfed1b000)
 
-#include <southbridge/intel/common/rcba.h>
+#include <southbridge/intel/common/rcba.h> /* IWYU pragma: export */
 
 #define DEFAULT_PMBASE		0x00000500
 #define DEFAULT_TCOBASE		(DEFAULT_PMBASE + 0x60)
diff --git a/src/southbridge/intel/ibexpeak/pch.h b/src/southbridge/intel/ibexpeak/pch.h
index 83e86c2..1f5b4ea 100644
--- a/src/southbridge/intel/ibexpeak/pch.h
+++ b/src/southbridge/intel/ibexpeak/pch.h
@@ -4,6 +4,7 @@
 #define SOUTHBRIDGE_INTEL_BD82X6X_PCH_H
 
 #include <acpi/acpi.h>
+#include <southbridge/intel/common/rcba.h> /* IWYU pragma: export */
 
 /* PCH types */
 #define PCH_TYPE_CPT	   0x1c /* CougarPoint */
@@ -24,8 +25,6 @@
 #define DEFAULT_PMBASE		0x0500
 #define DEFAULT_HECIBAR		((u8 *)0xfed17000)
 
-#include <southbridge/intel/common/rcba.h>
-
 #ifndef __ACPI__
 
 void pch_iobp_update(u32 address, u32 andvalue, u32 orvalue);
diff --git a/src/southbridge/intel/lynxpoint/pch.h b/src/southbridge/intel/lynxpoint/pch.h
index 7d9fc6d..1623274 100644
--- a/src/southbridge/intel/lynxpoint/pch.h
+++ b/src/southbridge/intel/lynxpoint/pch.h
@@ -4,6 +4,7 @@
 #define SOUTHBRIDGE_INTEL_LYNXPOINT_PCH_H
 
 #include <acpi/acpi.h>
+#include <southbridge/intel/common/rcba.h> /* IWYU pragma: export */
 
 #define CROS_GPIO_DEVICE_NAME	"LynxPoint"
 
@@ -55,8 +56,6 @@
 #define DEFAULT_GPIOSIZE	0x80
 #endif
 
-#include <southbridge/intel/common/rcba.h>
-
 #ifndef __ACPI__
 
 #if CONFIG(INTEL_LYNXPOINT_LP)