reset: zx2967: constify zx2967_reset_ops.

File size before:
   text	   data	    bss	    dec	    hex	filename
    794	    232	      0	   1026	    402	drivers/reset/reset-zx2967.o

File size After adding 'const':
   text	   data	    bss	    dec	    hex	filename
    842	    184	      0	   1026	    402	drivers/reset/reset-zx2967.o

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Reviewed-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/reset/reset-zx2967.c b/drivers/reset/reset-zx2967.c
index 4dabb9e..4f319f7 100644
--- a/drivers/reset/reset-zx2967.c
+++ b/drivers/reset/reset-zx2967.c
@@ -55,7 +55,7 @@
 	return zx2967_reset_act(rcdev, id, false);
 }
 
-static struct reset_control_ops zx2967_reset_ops = {
+static const struct reset_control_ops zx2967_reset_ops = {
 	.assert		= zx2967_reset_assert,
 	.deassert	= zx2967_reset_deassert,
 };