types: Simplify ostream operators
types: Simplify ostream operators

We don't really care if it derives from ostream, just take any type.

Change-Id: Ifab0b7bd4476ddecc7fe80923b82f012a2974f47
Signed-off-by: William A. Kennington III <30fff5198f4d10ca1117e5f3ec82f3b4b8900d81@google.com>

openbmc/phosphor-networkd,openbmc/phosphor-networkd