clk: nxp: Remove CLK_IS_ROOT

This flag is a no-op now. Remove usage of the flag.
Acked-by: Joachim Eastwood <manabian@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/nxp/clk-lpc18xx-cgu.c

@@ -605,7 +605,7 @@ static void __init lpc18xx_cgu_register_source_clks(struct device_node *np,
 
 	/* Register the internal 12 MHz RC oscillator (IRC) */
 	clk = clk_register_fixed_rate(NULL, clk_src_names[CLK_SRC_IRC],
-				      NULL, CLK_IS_ROOT, 12000000);
+				      NULL, 0, 12000000);
 	if (IS_ERR(clk))
 		pr_warn("%s: failed to register irc clk\n", __func__);