efi_loader: remove stray #define LOG_CATEGORY LOGL_ERR

The statement '#define LOG_CATEGORY LOGL_ERR' makes not sense. LOGL_ERR is
not a LOG_CATEGORY. Remove the statement.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index 53b40c8..1b08ca8 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -5,8 +5,6 @@
  * (C) Copyright 2017 Rob Clark
  */
 
-#define LOG_CATEGORY LOGL_ERR
-
 #include <common.h>
 #include <blk.h>
 #include <dm.h>