staging: iio: resolver: new driver for AD2S90 devices

This also kicks off the new resolver subsection.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
index 5b449a1..f9b5fb2 100644
--- a/drivers/staging/iio/Makefile
+++ b/drivers/staging/iio/Makefile
@@ -19,4 +19,5 @@
 obj-y += light/
 obj-y += magnetometer/
 obj-y += meter/
+obj-y += resolver/
 obj-y += trigger/