fpga: altera-cvp: Fix function definition argument

Fix the following checkpatch warning:
WARNING: function definition argument 'struct altera_cvp_conf *'
Signed-off-by: NCarlos A Petry <capetry.dev@gmail.com>
Signed-off-by: NMoritz Fischer <mdf@kernel.org>

drivers/fpga/altera-cvp.c

@@ -57,7 +57,8 @@ struct altera_cvp_conf {
 	struct fpga_manager	*mgr;
 	struct pci_dev		*pci_dev;
 	void __iomem		*map;
-	void			(*write_data)(struct altera_cvp_conf *, u32);
+	void			(*write_data)(struct altera_cvp_conf *conf,
+					      u32 data);
 	char			mgr_name[64];
 	u8			numclks;
 };