etnaviv: add flags parameter to texture barrier

Fixes compile warning introduced by commit a1c848.

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/src/gallium/drivers/etnaviv/etnaviv_texture.c b/src/gallium/drivers/etnaviv/etnaviv_texture.c
index 6b64de2..c020fb2 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_texture.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_texture.c
@@ -317,7 +317,7 @@
 }
 
 static void
-etna_texture_barrier(struct pipe_context *pctx)
+etna_texture_barrier(struct pipe_context *pctx, unsigned flags)
 {
    struct etna_context *ctx = etna_context(pctx);
    /* clear color and texture cache to make sure that texture unit reads