[PATCH v3] iio: patch set ltc2632

[Chris Ruehl]

Patchset to extend ltc2632 spi driver to support the similar chip set
ltc2634.
* Patch v3 1/3 update documentation struct ltc2632_chip_info
* Patch v3 2/3 patch ltc2632.c,Kconfig,ltc2632.txt(devtree)
* Patch v3 3/3 convert ltc2632.txt to yaml format named lltc,ltc2632.yaml

* Patch v3 2/3 : correct help text

Signed-off-by: Chris Ruehl <chris.ruehl@xxxxxxxxxxxx>
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