iio: mma8452: remove unused register description

Signed-off-by: NMartin Kepplinger <martin.kepplinger@theobroma-systems.com>
Signed-off-by: NChristoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/accel/mma8452.c

@@ -58,7 +58,6 @@
 #define MMA8452_FF_MT_COUNT			0x18
 #define MMA8452_TRANSIENT_CFG			0x1d
 #define  MMA8452_TRANSIENT_CFG_HPF_BYP		BIT(0)
-#define  MMA8452_TRANSIENT_CFG_CHAN(chan)	BIT(chan + 1)
 #define  MMA8452_TRANSIENT_CFG_ELE		BIT(4)
 #define MMA8452_TRANSIENT_SRC			0x1e
 #define  MMA8452_TRANSIENT_SRC_XTRANSE		BIT(1)