iio: mxs-lradc: Fix 'duplicate const' warning

The following warning is generated by sparse:

drivers/staging/iio/adc/mxs-lradc.c:118:47: warning: duplicate const

Remove the duplicate const.
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/staging/iio/adc/mxs-lradc.c

@@ -114,7 +114,7 @@ struct mxs_lradc_of_config {
 	const char * const	*irq_name;
 };
 
-static const struct mxs_lradc_of_config const mxs_lradc_of_config[] = {
+static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
 	[IMX23_LRADC] = {
 		.irq_count	= ARRAY_SIZE(mx23_lradc_irq_names),
 		.irq_name	= mx23_lradc_irq_names,