IIO: GYRO: Add MACRO for gyro quadrature correction

From: Cliff Cai <cliff.cai@analog.com>

Add gyro_z_quadrature_correction_raw define.
Signed-off-by: NCliff Cai <cliff.cai@analog.com>
Signed-off-by: NMichael Hennerich <michael.hennerich@analog.com>
Acked-by: NJonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/iio/gyro/gyro.h

@@ -57,6 +57,9 @@
 #define IIO_DEV_ATTR_GYRO_Z_CALIBSCALE(_mode, _show, _store, _addr)		\
 	IIO_DEVICE_ATTR(gyro_z_calibscale, _mode, _show, _store, _addr)
 
+#define IIO_DEV_ATTR_GYRO_Z_QUADRATURE_CORRECTION(_show, _addr)		\
+	IIO_DEVICE_ATTR(gyro_z_quadrature_correction_raw, S_IRUGO, _show, NULL, _addr)
+
 #define IIO_DEV_ATTR_GYRO(_show, _addr)			\
 	IIO_DEVICE_ATTR(gyro_raw, S_IRUGO, _show, NULL, _addr)