clk: qoriq: Remove CLK_IS_ROOT

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

Cc: Hou Zhiqiang <[e-mail]>
Cc: Scott Wood <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/clk-qoriq.c

···
 	if (of_property_read_u32(node, "clock-frequency", &rate))
 		return ERR_PTR(-ENODEV);
 
-	return clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);
+	return clk_register_fixed_rate(NULL, name, NULL, 0, rate);
 }
 
 static struct clk *sysclk_from_parent(const char *name)