iio: imu: st_lsm6dsx: Set buffer sampling frequency for accelerometer only

In the Linux kernel, the following vulnerability has been resolved:

iio: imu: st_lsm6dsx: Set buffer sampling frequency for accelerometer only

The st_lsm6dsx_hwfifo_odr_store() function, which is called when userspace

writes the buffer sampling frequency sysfs attribute, calls

st_lsm6dsx_check_odr(), which accesses the odr_table array at index

`sensor->id`; since this array is only 2 entries long, an access for any

sensor type other than accelerometer or gyroscope is an out-of-bounds

access.

The motivation for being able to set a buffer frequency different from the

sensor sampling frequency is to support use cases that need accurate event

detection (which requires a high sampling frequency) while retrieving

sensor data at low frequency. Since all the supported event types are

generated from acceleration data only, do not create the buffer sampling

frequency attribute for sensor types other than the accelerometer.