drm/ttm: Use a static string instead of an array of char *

Make the object a bit smaller by using a simple string instead
of a format string and array of char *.

$ size drivers/gpu/drm/ttm/ttm_page_alloc_dma.o*
   text	   data	    bss	    dec	    hex	filename
   8820	    216	   4136	  13172	   3374	drivers/gpu/drm/ttm/ttm_page_alloc_dma.o.defconfig.new
   8910	    216	   4136	  13262	   33ce	drivers/gpu/drm/ttm/ttm_page_alloc_dma.o.defconfig.old
  25383	   5044	   4384	  34811	   87fb	drivers/gpu/drm/ttm/ttm_page_alloc_dma.o.allyesconfig.new
  25797	   5428	   4384	  35609	   8b19	drivers/gpu/drm/ttm/ttm_page_alloc_dma.o.allyesconfig.old

Miscellanea:

o The h array had more entries than were emitted, all are now removed
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/ttm/ttm_page_alloc_dma.c

@@ -1244,15 +1244,12 @@ int ttm_dma_page_alloc_debugfs(struct seq_file *m, void *data)
 {
 	struct device_pools *p;
 	struct dma_pool *pool = NULL;
-	char *h[] = {"pool", "refills", "pages freed", "inuse", "available",
-		     "name", "virt", "busaddr"};
 
 	if (!_manager) {
 		seq_printf(m, "No pool allocator running.\n");
 		return 0;
 	}
-	seq_printf(m, "%13s %12s %13s %8s %8s %8s\n",
-		   h[0], h[1], h[2], h[3], h[4], h[5]);
+	seq_printf(m, "         pool      refills   pages freed    inuse available     name\n");
 	mutex_lock(&_manager->lock);
 	list_for_each_entry(p, &_manager->pools, pools) {
 		struct device *dev = p->dev;