gallium/u_suballoc: allow different alignment for each allocation

Just move the alignment parameter from u_suballocator_create
to u_suballocator_alloc.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Tested-by: Grazvydas Ignotas <notasas@gmail.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>

src/gallium/drivers/r600/r600_asm.c

@@ -2615,7 +2615,8 @@ void *r600_create_vertex_fetch_shader(struct pipe_context *ctx,
 		return NULL;
 	}
 
-	u_suballocator_alloc(rctx->allocator_fetch_shader, fs_size, &shader->offset,
+	u_suballocator_alloc(rctx->allocator_fetch_shader, fs_size, 256,
+			     &shader->offset,
 			     (struct pipe_resource**)&shader->buffer);
 	if (!shader->buffer) {
 		r600_bytecode_clear(&bc);