pwrctl: add pgood state switching application

pgood_wait simply blocks until the power state changes to
the requested state.

The intent is for use from a systemd unit similar to nm-online.

Change-

pwrctl: add pgood state switching application

pgood_wait simply blocks until the power state changes to
the requested state.

The intent is for use from a systemd unit similar to nm-online.

Change-Id: Icf1e18f5d47d6eb2fc424b4614fd196ef3dfd6ee
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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