iommu/fsl: Add void declarations in zero-arg functions.

Added explicit void declarations to zero-argument function headers.
The following coccinelle script was used:
@addvoid@
identifier f;
@@

f(
+ void
 ) { ... }

Signed-off-by: Chi Pham <fempsci@gmail.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c
index 0009dff..8f42e8e 100644
--- a/drivers/iommu/fsl_pamu_domain.c
+++ b/drivers/iommu/fsl_pamu_domain.c
@@ -1156,7 +1156,7 @@
 	.remove_device	= fsl_pamu_remove_device,
 };
 
-int pamu_domain_init()
+int pamu_domain_init(void)
 {
 	int ret = 0;