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>

src/include/device/mmio.h

@@ -3,7 +3,7 @@
 #ifndef __DEVICE_MMIO_H__
 #define __DEVICE_MMIO_H__
 
-#include <arch/mmio.h>
+#include <arch/mmio.h> /* IWYU pragma: export */
 #include <commonlib/helpers.h>
 #include <endian.h>
 #include <types.h>

src/include/device/pci.h

@@ -19,14 +19,15 @@
 
 #if CONFIG(PCI)
 
-#include <stdint.h>
-#include <stddef.h>
-#include <device/pci_def.h>
-#include <device/resource.h>
+/* When <device/pci.h> is needed, it supposed to provide <device/pci_{def,type}.h> */
 #include <device/device.h>
+#include <device/pci_def.h> /* IWYU pragma: export */
 #include <device/pci_ops.h>
 #include <device/pci_rom.h>
-#include <device/pci_type.h>
+#include <device/pci_type.h> /* IWYU pragma: export */
+#include <device/resource.h>
+#include <stddef.h>
+#include <stdint.h>
 
 /* Common pci operations without a standard interface */
 struct pci_operations {

src/include/device/pci_ops.h

@@ -6,7 +6,7 @@
 #include <stdint.h>
 #include <device/device.h>
 #include <device/pci_type.h>
-#include <arch/pci_ops.h>
+#include <arch/pci_ops.h> /* IWYU pragma: export */
 
 void __noreturn pcidev_die(void);
 

src/include/device/pnp.h

@@ -6,8 +6,8 @@
 #include <stdint.h>
 #include <device/device.h>
 /* When <device/pnp.h> is needed, it supposed to provide <device/pnp_{def,type}.h> */
-#include <device/pnp_def.h>
-#include <device/pnp_type.h>
+#include <device/pnp_def.h> /* IWYU pragma: export */
+#include <device/pnp_type.h> /* IWYU pragma: export */
 #include <arch/io.h>
 
 #if !ENV_PNP_SIMPLE_DEVICE