obmc-op-control-power: Remove machine-specific patches

Remove net name patches from Firestone, Garrison, and Witherspoon. The
equivalent configuration was moved into the Python machine config.

Fixes openbmc/openbmc#601, fixes openbmc/openbmc#636, and
fixes openbmc/openbmc#637.

Change-Id: I2c2b03b506abffc1511e53dc622f42fe0589b00f
Signed-off-by: Xo Wang <xow@google.com>
6 files changed