system: core: Add Sensors group

Defining group for sensors.

CRs-Fixed: 431081

Change-Id: I58151f2fd727bded1b16adb3caeac85e27e44036
core: Correct the sensors UID

Change-Id: I4e456de6dfa6612caf9dcef751f39e9e478a775e
init: add a new charger-fs trigger in the power off charging mode

Add the charger-fs trigger and mount the charger file system earlier
than the propery service init in the power off charging mode.

Change-Id: Iecc0fcdabca836365d6822ca6ef9e0944258d687