powerpc/macintosh: Make Open Firmware device id constant

The match_table field of the struct of_device_id is constant in <linux/of_platform.h>
so it is worth to make the initialization data also constant.

The semantic match that finds this kind of pattern is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
disable decl_init,const_decl_init;
identifier I1, I2, x;
@@
	struct I1 {
	  ...
	  const struct I2 *x;
	  ...
	};
@s@
identifier r.I1, y;
identifier r.x, E;
@@
	struct I1 y = {
	  .x = E,
	};
@c@
identifier r.I2;
identifier s.E;
@@
	const struct I2 E[] = ... ;
@depends on !c@
identifier r.I2;
identifier s.E;
@@
+	const
	struct I2 E[] = ...;
// </smpl>
Signed-off-by: Márton Németh <nm127@freemail.hu>
Cc: Julia Lawall <julia@diku.dk>
Cc: cocci@diku.dk
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

drivers/macintosh/smu.c

@@ -660,7 +660,7 @@ static int smu_platform_probe(struct of_device* dev,
 	return 0;
 }
 
-static struct of_device_id smu_platform_match[] =
+static const struct of_device_id smu_platform_match[] =
 {
 	{
 		.type		= "smu",

drivers/macintosh/therm_pm72.c

@@ -2211,7 +2211,7 @@ static int fcu_of_remove(struct of_device* dev)
 	return 0;
 }
 
-static struct of_device_id fcu_match[] = 
+static const struct of_device_id fcu_match[] = 
 {
 	{
 	.type		= "fcu",

drivers/macintosh/therm_windtunnel.c

@@ -457,7 +457,7 @@ therm_of_remove( struct of_device *dev )
 	return 0;
 }
 
-static struct of_device_id therm_of_match[] = {{
+static const struct of_device_id therm_of_match[] = {{
 	.name		= "fan",
 	.compatible	= "adm1030"
     }, {}