chore: remove providermeta patch (#233)

The upstream provider upgrade to v2.10.0 is failing because the resource
& datasource maps were moved out of `equinix/provider.go` and
`internal/provider/provider.go`, which is causing one of the patches in
this repo to fail to apply.

In local testing, removing this patch doesn't appear to have any impact
on the generated code, and its removal allows the upgrade to proceed.