clk: pistachio: Declare mux table as const u32[]

Now that clk_register_mux_table takes a const u32 *, we can declare the
mux table as const u32[].
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20220205103613.1216218-8-j.neuschaefer@gmx.netSigned-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/pistachio/clk-pistachio.c

@@ -154,7 +154,7 @@ static struct pistachio_pll pistachio_plls[] __initdata = {
 PNAME(mux_debug) = { "mips_pll_mux", "rpu_v_pll_mux",
 		     "rpu_l_pll_mux", "sys_pll_mux",
 		     "wifi_pll_mux", "bt_pll_mux" };
-static u32 mux_debug_idx[] = { 0x0, 0x1, 0x2, 0x4, 0x8, 0x10 };
+static const u32 mux_debug_idx[] = { 0x0, 0x1, 0x2, 0x4, 0x8, 0x10 };
 
 static unsigned int pistachio_critical_clks_core[] __initdata = {
 	CLK_MIPS