Fix unknown-crate when using self-profile with rustdoc

... by removing a duplicate `crate_name` field in `interface::Config`,
making it clear that rustdoc should be passing it to `config::Options`
instead.

compiler/rustc_driver/src/lib.rs

@@ -223,7 +223,6 @@ fn run_compiler(
             file_loader: None,
             diagnostic_output,
             stderr: None,
-            crate_name: None,
             lint_caps: Default::default(),
             register_lints: None,
             override_queries: None,
@@ -307,7 +306,6 @@ fn run_compiler(
         file_loader,
         diagnostic_output,
         stderr: None,
-        crate_name: None,
         lint_caps: Default::default(),
         register_lints: None,
         override_queries: None,