ga-b75m-d3h: Remove duplicate sata_port_map

Change-Id: I128f1dfea013a4f94c5b006a90c10aa32563d81c
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7691
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Tested-by: build bot (Jenkins)