clk: wm831x: Remove CLK_IS_ROOT

This flag is a no-op now. Remove usage of the flag.

Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/clk-wm831x.c

@@ -58,7 +58,6 @@ static const struct clk_ops wm831x_xtal_ops = {
 static struct clk_init_data wm831x_xtal_init = {
 	.name = "xtal",
 	.ops = &wm831x_xtal_ops,
-	.flags = CLK_IS_ROOT,
 };
 
 static const unsigned long wm831x_fll_auto_rates[] = {