serial/ns16550: don't generate functions for undefined ports
This saved 640 bytes on MPC8536DS (a board with two of the six
ports defined).
Signed-off-by: NScott Wood <scottwood@freescale.com>
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This saved 640 bytes on MPC8536DS (a board with two of the six
ports defined).
Signed-off-by: NScott Wood <scottwood@freescale.com>