iio: proximity: SAR Stable Setting V1.2.3

iio: proximity: SAR Stable Setting V1.2.3

- improved target and base value setting for DVT1.
- hw configuration:1.5K+2pf , DNP+2pf , DNP+DNP.

Bug 1696152

Signed-off-by: Shylender Gaddamwar <sgaddamwar@nvidia.com>
Change-Id: I50870a56752f60df55751760ae3bb84e9cf23ebe
Reviewed-on: http://git-master/r/818484
(cherry picked from commit 59df06896a9959e246f4cf3769c724587284eca1)
Reviewed-on: http://git-master/r/823557
GVS: Gerrit_Virtual_Submit
Reviewed-by: Robert Collins <rcollins@nvidia.com>
Tested-by: Robert Collins <rcollins@nvidia.com>