clk: imx: clk-imx7ulp: Add missing sentinel of ulp_div_table

There should be a sentinel of ulp_div_table, otherwise _get_table_div
may access data out of the array.

Fixes: b1260067 ("clk: imx: add imx7ulp clk driver")
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/clk/imx/clk-imx7ulp.c

@@ -40,6 +40,7 @@ static const struct clk_div_table ulp_div_table[] = {
 	{ .val = 5, .div = 16, },
 	{ .val = 6, .div = 32, },
 	{ .val = 7, .div = 64, },
+	{ /* sentinel */ },
 };
 
 static const int pcc2_uart_clk_ids[] __initconst = {