sandbox: Increase the early-trace-buffer size

This buffer is too small now that sandbox has grown in size. Increase it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/configs/sandbox.h b/include/configs/sandbox.h
index e36a5fe..6dd03e3 100644
--- a/include/configs/sandbox.h
+++ b/include/configs/sandbox.h
@@ -9,7 +9,7 @@
 #ifdef FTRACE
 #define CONFIG_TRACE
 #define CONFIG_TRACE_BUFFER_SIZE	(16 << 20)
-#define CONFIG_TRACE_EARLY_SIZE		(8 << 20)
+#define CONFIG_TRACE_EARLY_SIZE		(16 << 20)
 #define CONFIG_TRACE_EARLY
 #define CONFIG_TRACE_EARLY_ADDR		0x00100000