1st set of IIO fixes for the 6.1 cycle.

Usual bunch of driver fixes + one set of fixes for driver bugs
introduced by a core change to how buffer attributes are handled.

- buffer attributes
  * Remove usage of IIO_CONST_ATTR() for buffer attributes in all drivers
    where this occurred as that broke wrapping code need to duplicate these
    for multiple buffer support. The minimal fix is moving to
    IIO_DEVICE_ATTR_RO() with separate _show() routines.  A cleanup of
    this code, preventing similar issues in future will follow next merge
    window.
- tools/iio
  * Wrong handling of number of digits in the number 0.
- adi,ltc2983
  * Avoid reallocating channels on each wake up from sleep by moving
    that step out of the ltc2983_setup() function.
- microchip,mcp3911
  * Wrong ID bits + masking in debug prints.
  * Fix ARRAY_SIZE() vs sizeof() mix up.
  * Handle NULL return on trigger allocation failure correctly.
- st,stm32-adc:
  * Ensure we initialize sampling time even when optional property not
    provided in DT. Internal channels require a minimum value that will
    not otherwise be set.
- taos,tsl2583
  * Fix a double call of iio_device_unregister() via device managed and
    un-managed paths.
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