Drop the log buffer

This does not appear to be used by any boards. Before introducing a new
log system, remove this old one.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/include/post.h b/include/post.h
index d527811..b41a6c8 100644
--- a/include/post.h
+++ b/include/post.h
@@ -15,7 +15,7 @@
 #include <common.h>
 #include <asm/io.h>
 
-#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)
+#if defined(CONFIG_POST)
 
 #ifndef CONFIG_POST_EXTERNAL_WORD_FUNCS
 #ifdef CONFIG_SYS_POST_WORD_ADDR
@@ -58,7 +58,7 @@
 extern void post_word_store(ulong value);
 
 #endif /* CONFIG_POST_EXTERNAL_WORD_FUNCS */
-#endif /* defined (CONFIG_POST) || defined(CONFIG_LOGBUFFER) */
+#endif /* defined (CONFIG_POST) */
 #endif /* __ASSEMBLY__ */
 
 #ifdef CONFIG_POST