Add a new software-only sensor device. This is intended for use as a
kernel module, and can be helpful to generate sysmon_envsys events
when creating/modifying powerd scripts. This will also be use

Add a new software-only sensor device. This is intended for use as a
kernel module, and can be helpful to generate sysmon_envsys events
when creating/modifying powerd scripts. This will also be used in an
upcoming series of atf tests for sysmon_envsys itself.

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