iio: st_accel_core: Remove unneeded define

Definition of ST_SENSORS_WAI_ADDRESS was introduced within a very
first commit of this driver, but it was never used.
This address is already defined as ST_SENSORS_DEFAULT_WAI_ADDRESS
in include/linux/iio/common/st_sensors.h

To avoid duplication of the same constant in two different places
called almost exactly the same, the one which was never used
should be removed.
Signed-off-by: Robert Kmiec <robert.r.kmiec@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/common/st_sensors/st_sensors_core.c

@@ -18,9 +18,6 @@
 #include <asm/unaligned.h>
 #include <linux/iio/common/st_sensors.h>
 
-
-#define ST_SENSORS_WAI_ADDRESS		0x0f
-
 static inline u32 st_sensors_get_unaligned_le24(const u8 *p)
 {
 	return (s32)((p[0] | p[1] << 8 | p[2] << 16) << 8) >> 8;