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>

arch/x86/cpu/broadwell/sdram.c

@@ -5,6 +5,8 @@
  * From coreboot src/soc/intel/broadwell/romstage/raminit.c
  */
 
+#define LOG_CATEGORY UCLASS_RAM
+
 #include <common.h>
 #include <dm.h>
 #include <init.h>

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>