Update new_platform_support.md (#2603)

Change link of system_setup.h

BUG=cleanup

tensorflow/lite/micro/docs/new_platform_support.md

diff --git a/tensorflow/lite/micro/docs/new_platform_support.md b/tensorflow/lite/micro/docs/new_platform_support.md
index 692d98e..452fe91 100644
--- a/tensorflow/lite/micro/docs/new_platform_support.md
+++ b/tensorflow/lite/micro/docs/new_platform_support.md
@@ -77,7 +77,7 @@
 that when linking TFLM into a binary, the implementations of the functions in
 [debug\_log.h](https://github.com/tensorflow/tflite-micro/blob/main/tensorflow/lite/micro/debug_log.h),
 [micro\_time.h](https://github.com/tensorflow/tflite-micro/blob/main/tensorflow/lite/micro/micro_time.h)
-and [system\_setup.h](https://github.com/tensorflow/tflite-micro/blob/main/tensorflow/lite/micro/debug_log.h)
+and [system\_setup.h](https://github.com/tensorflow/tflite-micro/blob/main/tensorflow/lite/micro/system_setup.h)
 can be found.
 
 For example, the implementations of these functions for: