clk: nxp: Declare mux table parameter as const u32 *

lpc18xx_fill_parent_names's "id" parameter isn't used for writing, so
let's make it const.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220205103613.1216218-3-j.neuschaefer@gmx.net
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: neuschaefer

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

@@ -522,7 +522,7 @@ static struct lpc18xx_cgu_pll_clk lpc18xx_cgu_src_clk_plls[] = {
 	LPC1XX_CGU_CLK_PLL(PLL1,	pll1_src_ids, pll1_ops),
 };
 
-static void lpc18xx_fill_parent_names(const char **parent, u32 *id, int size)
+static void lpc18xx_fill_parent_names(const char **parent, const u32 *id, int size)
 {
 	int i;