pimgen: Pass interfaces.yaml to Mako template
pimgen: Pass interfaces.yaml to Mako template

Update pimgen.py to pass interfaces.yaml to the Mako
template in prep for generating the interface -> binding
factory method associations.

Change-Id: Ic053628331ef0e5a1ef4a8a9d50ff6f4e662cf08
Signed-off-by: Brad Bishop <713d098c0be4c8fd2bf36a94cd08699466677ecd@fuzziesquirrel.com>

openbmc/phosphor-inventory-manager,openbmc/phosphor-inventory-manager