iio:triggers:interrupt trigger - move out of staging.

This is now a very simple trigger indeed but useful in many common cases.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
diff --git a/drivers/iio/trigger/Makefile b/drivers/iio/trigger/Makefile
index e0b2183..ce319a5 100644
--- a/drivers/iio/trigger/Makefile
+++ b/drivers/iio/trigger/Makefile
@@ -2,4 +2,5 @@
 # Makefile for triggers not associated with iio-devices
 #
 
+obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o
 obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o