test(memory_arena_threshold): adjust expected value with compression

Fix a test failure by setting a different expected value for the
persistent buffer allocation when compression is configured in. The
allocation was allowed to vary by 3%; however, compression adds ~10%.
Set the expected value to the measured value when compression is
configured in.

tensorflow/lite/micro/memory_arena_threshold_test.cc

@@ -74,7 +74,6 @@ constexpr int kKeywordModelOnlyTotalSize = 14936;
 // TODO(b/207157610): replace magic number that depends on OPs
 constexpr int kKeywordModelOnlyTailSize = 14264;
 constexpr int kKeywordModelPersistentTfLiteTensorDataSize = 224;
-constexpr int kKeywordModelPersistentBufferDataSize = 840;
 #endif
 constexpr int kKeywordModelHeadSize = 672;
 constexpr int kKeywordModelTfLiteTensorVariableBufferDataSize = 10240;
@@ -87,6 +86,15 @@ uint8_t test_conv_tensor_arena[kTestConvModelArenaSize];
 constexpr int kTestConvModelTensorCount = 15;
 constexpr int kTestConvModelNodeAndRegistrationCount = 7;
 
+constexpr int kKeywordModelPersistentBufferDataSize =
+#if defined(TF_LITE_STATIC_MEMORY)
+  832;
+#elif defined(USE_TFLM_COMPRESSION)
+  920;
+#else
+  840;
+#endif
+
 // NOTE: These values are measured on x86-64:
 // TODO(b/158651472): Consider auditing these values on non-64 bit systems.
 #ifdef TF_LITE_STATIC_MEMORY