iio: core: use INDIO_ALL_BUFFER_MODES in iio_buffer_enabled()

This replaces use of individual buffer mode flags with
INDIO_ALL_BUFFER_MODES in the iio_buffer_enabled() function.

This simplifies the code and makes it robust in case of the addition of
new buffer modes.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20240108200647.3916681-1-dlechner@baylibre.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/industrialio-core.c

@@ -213,9 +213,7 @@ bool iio_buffer_enabled(struct iio_dev *indio_dev)
 {
 	struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(indio_dev);
 
-	return iio_dev_opaque->currentmode &
-	       (INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE |
-		INDIO_BUFFER_TRIGGERED);
+	return iio_dev_opaque->currentmode & INDIO_ALL_BUFFER_MODES;
 }
 EXPORT_SYMBOL_GPL(iio_buffer_enabled);