clk: lan966x: make clk_names const char * const

Change clk_names to const char * const to silence checkpatch in
subsequent patches.

Signed-off-by: Daniel Machon <daniel.machon@microchip.com>
Link: https://lore.kernel.org/r/20240916-lan969x-clock-v1-2-0e150336074d@microchip.com
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: Danielmachon

drivers/clk/clk-lan966x.c

@@ -24,7 +24,7 @@
 
 #define DIV_MAX		255
 
-static const char *clk_names[N_CLOCKS] = {
+static const char * const clk_names[N_CLOCKS] = {
 	"qspi0", "qspi1", "qspi2", "sdmmc0",
 	"pi", "mcan0", "mcan1", "flexcom0",
 	"flexcom1", "flexcom2", "flexcom3",