Define new 'obmc-chassis-blackout@.target'

This implements a new target 'obmc-chassis-blackout@.target' that works
to signify that a blackout has occurred on the chassis. This is useful
in situation

Define new 'obmc-chassis-blackout@.target'

This implements a new target 'obmc-chassis-blackout@.target' that works
to signify that a blackout has occurred on the chassis. This is useful
in situations where the system suffers from a blackout and the user
wants behavior that differs from the default of always running APR.
It will also be attached to services such as phosphor-sensor-states that
will ensure LEDs will be powered off.

Uses the proposed target added here
https://gerrit.openbmc.org/c/openbmc/phosphor-state-manager/+/54364

Tested:
- Booted an image with the corresponding changes to the bitbake
recipe and verified that the new target was found in
"/lib/systemd/system/".
- verified the target could be called by systemctl.
- obmc-chassis-blackout@0.target - Chassis Blackout Target
Loaded: loaded (/lib/systemd/system/obmc-chassis-blackout@.target; static)
Active: inactive (dead)
- started target.
- obmc-chassis-blackout@0.target - Chassis Blackout Target
Loaded: loaded (/lib/systemd/system/obmc-chassis-blackout@.target; static)
Active: active


Signed-off-by: Corey Hardesty <corey.hardesty@icloud.com>
Change-Id: Ic7aded7213153e7ee0d711e02368680ae72d08a8

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