libsensors framework

libsensors framework

Copied libsensors from Medfield and kept only sensor core files.
Removed all sensor specific files.

The commiters includes:
ommit 21964ccb08d199672cdf986cca91a714f55302ab
Author: Dragos Tatulea <dragos.tatulea@intel.com>

    libsensors: remove unneeded double close error

commit f5d69164ee57a048c4aa0f4747e43d8e894cca2f
Author: Dragos Tatulea <dragos.tatulea@intel.com>

    libsensors: refactor sensors to close fd on disable

commit a66c57c95532739c2e05c3aa40a26e0dc91da05b
Author: Dragos Tatulea <dragos.tatulea@intel.com>

    libsensors: check & skip sensor poll errors

commit 664ec9c48708a177eee9f68f3d11e57a35400a7b
Author: Dragos Tatulea <dragos.tatulea@intel.com>

    libsensors: base class enhancements

commit 9d16e254aab71082adf16749e771a54c84d26e24
Author: Dragos Tatulea <dragos.tatulea@intel.com>

    libsensors: move to vendor and split in platform and common

Change-Id: I0fbb737155331a60e362bba9402a6a036a2ec2f6
Signed-off-by: srinivas pandruvada <srinivas.pandruvada@intel.com>