efi_loader: Move to normal debug infrastructure

We introduced special "DEBUG_EFI" defines when the efi loader
support was new. After giving it a bit of thought, turns out
we really didn't have to - the normal #define DEBUG infrastructure
works well enough for efi loader as well.

So this patch switches to the common debug() and #define DEBUG
way of printing debug information.

Signed-off-by: Alexander Graf <agraf@suse.de>
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 2a62dce..2169065 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -206,9 +206,7 @@
 #endif
 
 	/* Call our payload! */
-#ifdef DEBUG_EFI
-	printf("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
-#endif
+	debug("%s:%d Jumping to 0x%lx\n", __func__, __LINE__, (long)entry);
 
 	if (setjmp(&loaded_image_info.exit_jmp)) {
 		efi_status_t status = loaded_image_info.exit_status;