Input: adc-keys - drop bogus __refdata annotation

As the ADC ladder input driver does not have any code or data located in
initmem, there is no need to annotate the adc_keys_driver structure with
__refdata.  Drop the annotation, to avoid suppressing future section
warnings.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/7091e8213602be64826fd689a7337246d218f3b1.1626255421.git.geert+renesas@glider.beSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/adc-keys.c

@@ -193,7 +193,7 @@ static const struct of_device_id adc_keys_of_match[] = {
 MODULE_DEVICE_TABLE(of, adc_keys_of_match);
 #endif
 
-static struct platform_driver __refdata adc_keys_driver = {
+static struct platform_driver adc_keys_driver = {
 	.driver = {
 		.name = "adc_keys",
 		.of_match_table = of_match_ptr(adc_keys_of_match),