virtualization/linux-yocto: Backport IIO SCMI based sensors driver.

virtualization/linux-yocto: Backport IIO SCMI based sensors driver.

This patch series is the latest implementation of ARM SCMI Protocol
based IIO Device. Patch was cherry-picked from branch [1] created by IIO
maintainer.

[1]: https://lore.kernel.org/lkml/20210311210844.34371d8d@archlinux/

Bug-AGL: SPEC-3865
Upstream-Status: Submitted [https://lore.kernel.org/lkml/20210309231259.78050-1-jbhayana@google.com/]
Signed-off-by: Andriy Tryshnivskyy <andriy.tryshnivskyy@opensynergy.com>
Change-Id: Idef6f0630887c49c1d8e651a5ac753ad74b20dc0