network_manager: Inline trivial functions
network_manager: Inline trivial functions

Change-Id: Id8af08a2d0f64a40899250b33cb5b415c49afaee
Signed-off-by: William A. Kennington III <30fff5198f4d10ca1117e5f3ec82f3b4b8900d81@google.com>

openbmc/phosphor-networkd,openbmc/phosphor-networkd