Global Average Pooling operator in Subgraph API

PiperOrigin-RevId: 315943883
diff --git a/CMakeLists.txt b/CMakeLists.txt
index e57b258..fcf7e5b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -192,6 +192,7 @@
   src/subgraph/divide.c
   src/subgraph/fully-connected.c
   src/subgraph/floor.c
+  src/subgraph/global-average-pooling-2d.c
   src/subgraph/hardswish.c
   src/subgraph/leaky-relu.c
   src/subgraph/max-pooling-2d.c