PCI: hotplug: Clean up include files

arch/powerpc/include/asm/prom.h includes some headers that it doesn't need
itself.  Add the missing headers to files that include prom.h so we can
remove them from prom.h.

Link: https://lore.kernel.org/r/79201f5fae8d003164ac36ed3be7789db1bc5ab4.1648833421.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

drivers/pci/hotplug/pnv_php.c

@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/pci_hotplug.h>
+#include <linux/of_fdt.h>
 
 #include <asm/opal.h>
 #include <asm/pnv-pci.h>

drivers/pci/hotplug/rpadlpar_core.c

@@ -15,6 +15,7 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/string.h>
 #include <linux/vmalloc.h>

drivers/pci/hotplug/rpaphp_core.c

@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
+#include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/smp.h>
@@ -20,6 +21,7 @@
 #include <asm/eeh.h>       /* for eeh_add_device() */
 #include <asm/rtas.h>		/* rtas_call */
 #include <asm/pci-bridge.h>	/* for pci_controller */
+#include <asm/prom.h>
 #include "../pci.h"		/* for pci_add_new_bus */
 				/* and pci_do_scan_bus */
 #include "rpaphp.h"

drivers/pci/hotplug/rpaphp_pci.c

@@ -8,6 +8,7 @@
  * Send feedback to <lxie@us.ibm.com>
  *
  */
+#include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/string.h>
 

drivers/pci/hotplug/rpaphp_slot.c

@@ -11,6 +11,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/sysfs.h>
+#include <linux/of.h>
 #include <linux/pci.h>
 #include <linux/string.h>
 #include <linux/slab.h>