trace: Use notrace for short

The attribute syntax is quite verbose. Use the macro provided for this
purpose.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/efi_loader/efi_freestanding.c b/lib/efi_loader/efi_freestanding.c
index c85df02..4b65fc6 100644
--- a/lib/efi_loader/efi_freestanding.c
+++ b/lib/efi_loader/efi_freestanding.c
@@ -100,7 +100,7 @@
  * func_ptr:	Pointer to function being entered
  * caller:	Pointer to function which called this function
  */
-void __attribute__((no_instrument_function))
+void notrace
 __cyg_profile_func_enter(void *func_ptr, void *caller)
 {
 }
@@ -116,7 +116,7 @@
  * func_ptr:	Pointer to function being entered
  * caller:	Pointer to function which called this function
  */
-void __attribute__((no_instrument_function))
+void notrace
 __cyg_profile_func_exit(void *func_ptr, void *caller)
 {
 }