iio: adc: ad4695: fix backported MODULE_IMPORT_NS

Fix compile error due to backported MODULE_IMPORT_NS(). The 6.6 kernel
expects the argument to this to not be quoted while newer kernels
expect it to be quoted.

When we backported commit f09f140 ("iio: adc: ad4695: Add support
for SPI offload") we missed adapting this difference.

Signed-off-by: David Lechner <dlechner@baylibre.com>

Author: dlech

drivers/iio/adc/ad4695.c

@@ -2026,4 +2026,4 @@ MODULE_AUTHOR("Ramona Gradinariu <ramona.gradinariu@analog.com>");
 MODULE_AUTHOR("David Lechner <dlechner@baylibre.com>");
 MODULE_DESCRIPTION("Analog Devices AD4695 ADC driver");
 MODULE_LICENSE("GPL");
-MODULE_IMPORT_NS("IIO_DMAENGINE_BUFFER");
+MODULE_IMPORT_NS(IIO_DMAENGINE_BUFFER);