svsm: Stop pretty-printing SvsmError

Pretty-printing SvsmError in Debug formatting doesn't seem to be
particularly helpful at this point. For example:

[SVSM] Failed to launch /init: FileSystem(
    FileNotFound,
)

Change to using the default format to make logging more compact.

Signed-off-by: Peter Fang <peter.fang@intel.com>

kernel/src/svsm.rs

@@ -323,7 +323,7 @@ pub extern "C" fn svsm_main() {
     virt_log_usage();
 
     if let Err(e) = SVSM_PLATFORM.launch_fw(&config) {
-        panic!("Failed to launch FW: {e:#?}");
+        panic!("Failed to launch FW: {e:?}");
     }
 
     start_kernel_task(request_processing_main, String::from("request-processing"))
@@ -339,7 +339,7 @@ pub extern "C" fn svsm_main() {
 
     match exec_user("/init", opendir("/").expect("Failed to find FS root")) {
         Ok(_) => (),
-        Err(e) => log::info!("Failed to launch /init: {e:#?}"),
+        Err(e) => log::info!("Failed to launch /init: {e:?}"),
     }
 
     request_loop();