add first boot set mac script

phosphor-misc will use the meson build system - establish the initial
structure. Copy the first boot set mac script and systemd unit from
meta-openpower.

Change-Id: I

add first boot set mac script

phosphor-misc will use the meson build system - establish the initial
structure. Copy the first boot set mac script and systemd unit from
meta-openpower.

Change-Id: I1f7ebbb6b5230aa97b28e9a46ac721925b95a75a
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>

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