meta-google: gbmc-nic-config: Add recipe

This makes it possible for a machine to specify `GBMC_EXT_NICS` in the
machine configuration, signifying that it should treat an interface as
an external int

meta-google: gbmc-nic-config: Add recipe

This makes it possible for a machine to specify `GBMC_EXT_NICS` in the
machine configuration, signifying that it should treat an interface as
an external interface to the machine. It will then perform DHCP and
acquire gateway information and route all subordinate traffic out this
interface.

Change-Id: I75b0747b4e35bf6717c9a33a1f96a11beb425bb9
Signed-off-by: William A. Kennington III <wak@google.com>

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