swif: Add power supply sensors

Initially configure Swift's power supply sensors as they were on
Witherspoon. Keep the config files separate between systems as they will
be different due to differences between the power supplies used.

Tested:
    Built Swift image that contained the config files
    Built Witherspoon image that still contained the config files

Change-Id: I730c30658ebc2044bd2e1cd4a51467855734fba5
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
3 files changed