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.com


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>