iio: adc: ad7091r: Allow users to configure device events

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

iio: adc: ad7091r: Allow users to configure device events

AD7091R-5 devices are supported by the ad7091r-5 driver together with

the ad7091r-base driver. Those drivers declared iio events for notifying

user space when ADC readings fall bellow the thresholds of low limit

registers or above the values set in high limit registers.

However, to configure iio events and their thresholds, a set of callback

functions must be implemented and those were not present until now.

The consequence of trying to configure ad7091r-5 events without the

proper callback functions was a null pointer dereference in the kernel

because the pointers to the callback functions were not set.

Implement event configuration callbacks allowing users to read/write

event thresholds and enable/disable event generation.

Since the event spec structs are generic to AD7091R devices, also move

those from the ad7091r-5 driver the base driver so they can be reused

when support for ad7091r-2/-4/-8 be added.