add missing OC_PROTO_CSD flag to GP protocol
add missing OC_PROTO_CSD flag to GP protocol

Should have been in "Add support for checking and submitting HIP reports" on 4 March 2018 (4e35d505314ec0bb940fcadde25f540da38a2e11)

brandt/openconnect,brandt/openconnect,brandt/openconnect,brandt/openconnect