panfrost: Stop exposing internal panfrost_*_batch() functions

panfrost_{create,free,get}_batch() are only called inside pan_job.c.
Let's make them static.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
diff --git a/src/gallium/drivers/panfrost/pan_job.c b/src/gallium/drivers/panfrost/pan_job.c
index 00df900..03119e6 100644
--- a/src/gallium/drivers/panfrost/pan_job.c
+++ b/src/gallium/drivers/panfrost/pan_job.c
@@ -31,7 +31,7 @@
 #include "util/u_format.h"
 #include "util/u_pack_color.h"
 
-struct panfrost_batch *
+static struct panfrost_batch *
 panfrost_create_batch(struct panfrost_context *ctx,
                       const struct pipe_framebuffer_state *key)
 {
@@ -54,7 +54,7 @@
         return batch;
 }
 
-void
+static void
 panfrost_free_batch(struct panfrost_batch *batch)
 {
         if (!batch)
@@ -79,7 +79,7 @@
         ralloc_free(batch);
 }
 
-struct panfrost_batch *
+static struct panfrost_batch *
 panfrost_get_batch(struct panfrost_context *ctx,
                    const struct pipe_framebuffer_state *key)
 {