gpio-presence: Support for multiple iface assocs

This will allow additional interfaces to be specified
to associate with inventory items to allow for further
customization of inventory items.

Specifying property values for an interface added this way
is currently not supported.

Tested: Verified any given interface(s) is associated properly

Signed-off-by: Anthony Wilson <wilsonan@us.ibm.com>
Change-Id: I99e655b35120c82454a8851201218ec548ad9fe3
4 files changed