clk: sunxi: Add "cpu" to list of protected clocks for sun5i

Now that the ahb clock on sun5i/sun7i is muxable, ahb is no longer
guaranteed to be a child of the cpu clock. Add the cpu clock to
the list of protected clocks so it doesn't get disabled.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>

drivers/clk/sunxi/clk-sunxi.c

@@ -1349,6 +1349,7 @@ static void __init sun4i_a10_init_clocks(struct device_node *node)
 CLK_OF_DECLARE(sun4i_a10_clk_init, "allwinner,sun4i-a10", sun4i_a10_init_clocks);
 
 static const char *sun5i_critical_clocks[] __initdata = {
+	"cpu",
 	"pll5_ddr",
 	"ahb_sdram",
 };