control: Setup configured power on delay retrieval

A configured power on delay comes from either a compile time YAML
generated `_powerOnDelay` entry or from parsing a future manager JSON
configuration file.

Tested:
    No impact to YAML driven configurations
    An initial power on delay of zero when use of JSON enabled

Change-Id: If87260d1cb310a0c30698c47024127cd5e8a37e1
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
3 files changed