iio: core: add thermocouple_type standard attribute

We have a couple of thermocouple IIO drivers, supporting several chips.
Some of them support only one specific thermocouple type (e.g. "K", "J"),
one of them can be configured to work with several different thermocouple
types.

In certain applications thermocouples could be externally connected to the
chip by the user.

This patch introduces a new IIO standard attribute to report the supported
thermocouple type and, where applicable, to allow it to be dynamically set
using sysfs.

Cc: Hartmut Knaack <[email protected]>
Cc: Lars-Peter Clausen <[email protected]>
Cc: Peter Meerwald-Stadler <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Patrick Havelange <[email protected]>
Cc: Matt Weber <[email protected]>
Cc: Matt Ranostay <[email protected]>
Cc: Chuhong Yuan <[email protected]>
Cc: Daniel Gomez <[email protected]>
Cc: [email protected]
Signed-off-by: Andrea Merello <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>

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