datapath/loader: remove mentions of contrib/scripts/bindata.sh
datapath/loader: remove mentions of contrib/scripts/bindata.sh

Adjust godoc comments to no longer mention the contrib/script/bindata.sh
script removed by commit ff22f483938d ("make: remove the need for
go-bindata").

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

cilium/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,michi-covalent/cilium,cilium/cilium,tgraf/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium