message: processor: Replace infinite loop with sys_shutdown
  If fsgs is not available, exit via __sys_shutdown instead of staying in an infinite loop.
  Otherwise this causes delays for CI.
  If an infinite loop on error is required for baremetal
  this should be done in sys_shutdown .
diff: @@ -803,7 +803,7 @@ pub fn configure() {
  #[cfg(feature = "fsgsbase")]
  if !supports_fsgs() {
  error!("FSGSBASE support is enabled, but the processor doesn't support it!");
  - loop {}
  + crate::__sys_shutdown(1);
  }
  debug!("Set CR4 to 0x{:x}", cr4);
  