x86: Add some log categories

Add some missing log categories to a few files.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/tpl.c b/arch/x86/lib/tpl.c
index 18b05b2..273e9c8 100644
--- a/arch/x86/lib/tpl.c
+++ b/arch/x86/lib/tpl.c
@@ -3,6 +3,8 @@
  * Copyright (c) 2018 Google, Inc
  */
 
+#define LOG_CATEGORY	LOGC_BOOT
+
 #include <common.h>
 #include <debug_uart.h>
 #include <dm.h>