Update Paddle-Lite commit hash. (#26413)

* Update Paddle-Lite commit hash.

* Add BF16 data type to VarTyp protobuf message.

cmake/external/lite.cmake

@@ -34,7 +34,7 @@ if (NOT LITE_SOURCE_DIR OR NOT LITE_BINARY_DIR)
   set(LITE_INSTALL_DIR ${THIRD_PARTY_PATH}/install/lite)
 
   if(NOT LITE_GIT_TAG)
-    set(LITE_GIT_TAG 42ab4d559f6659edfc35040fb30fdcec3dc3f8aa)
+    set(LITE_GIT_TAG dfdfa6440c83bf0b415f9f5a9ff84842ce0bb0fa)
   endif()
 
   if(NOT CUDA_ARCH_NAME)

paddle/fluid/framework/framework.proto

@@ -115,6 +115,7 @@ message VarType {
     SIZE_T = 19;
     UINT8 = 20;
     INT8 = 21;
+    BF16 = 22;
 
     // Other types that may need additional descriptions
     LOD_TENSOR = 7;