Input: fsl-imx25-tcq - constify struct regmap_config

`mx25_tcq_regconfig` is not modified and can be declared as const to
move its data to a read-only section.
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20240705-input-const-regmap_config-v1-2-f712a4494883@gmail.comSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/touchscreen/fsl-imx25-tcq.c

@@ -38,7 +38,7 @@ struct mx25_tcq_priv {
 	struct device *dev;
 };
 
-static struct regmap_config mx25_tcq_regconfig = {
+static const struct regmap_config mx25_tcq_regconfig = {
 	.fast_io = true,
 	.max_register = 0x5c,
 	.reg_bits = 32,