iio: core: Simplify the registration of kfifo buffers

Among all the users of the kfifo buffers, no one uses the
INDIO_BUFFER_HARDWARE mode. So let's take this as a general rule and
simplify a little bit the internals - overall the documentation - by
eliminating unused specific cases. Use the INDIO_BUFFER_SOFTWARE mode by
default with kfifo buffers, which will basically mimic what all the "non
direct" modes do.

Cc: Benson Leung <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Jyoti Bhayana <[email protected]>
Cc: Jean-Baptiste Maneyrol <[email protected]>
Cc: Lorenzo Bianconi <[email protected]>
Cc: Michael Hennerich <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>

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