Rollup merge of #84930 - hermitcore:target, r=nagisa

rename LLVM target for RustyHermit

- RustyHermit is a library operating system, where the user-
  and the kernel-space use the same target
- by a mistake a previous patch changes the target to an incorect value
- this merge request revert the previous changes

compiler/rustc_target/src/spec/x86_64_unknown_none_hermitkernel.rs

@@ -11,7 +11,7 @@ pub fn target() -> Target {
     base.stack_probes = StackProbeType::Call;
 
     Target {
-        llvm_target: "x86_64-unknown-none-elf".to_string(),
+        llvm_target: "x86_64-unknown-hermit".to_string(),
         pointer_width: 64,
         data_layout: "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
             .to_string(),