endpoint: remove `CallsMapPath` function
endpoint: remove `CallsMapPath` function

This was no longer used outside of `CallsMapPathLocked`; factor the code from
`CallsMapPath` into `CallsMapPathLocked`.

Signed-off by: Ian Vernon <ian@cilium.io>

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