interface: fix interface_types.api enums
interface: fix interface_types.api enums

Unspecified c enums start at 0.
Unspecified api enums start at 1.

Type: fix

Change-Id: I431c11302c0ad897a968134ce90496af3db7bb86
Signed-off-by: Paul Vinciguerra <b92f79aabe4c9c18085c7347110a52af0898a0ef@vinciconsulting.com>

chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp