iommu/fsl_pamu: Prepare cleanup of powerpc's asm/prom.h

powerpc's asm/prom.h brings some headers that it doesn't
need itself.

In order to clean it up, first add missing headers in
users of asm/prom.h

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/06862cca930068e8fa4fdd0b20d74872d3b929d6.1648833431.git.christophe.leroy@csgroup.eu
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: chleroy

drivers/iommu/fsl_pamu.c

@@ -11,6 +11,9 @@
 #include <linux/fsl/guts.h>
 #include <linux/interrupt.h>
 #include <linux/genalloc.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
 
 #include <asm/mpc85xx.h>
 

drivers/iommu/fsl_pamu_domain.c

@@ -9,6 +9,7 @@
 
 #include "fsl_pamu_domain.h"
 
+#include <linux/platform_device.h>
 #include <sysdev/fsl_pci.h>
 
 /*