qcacld-3.0: Enable qdf hashtable feature

Enable the QDF hashtable feature, recently added in
I07999e5fc8116e67b3850b866ced20af64342055.

Change-Id: I1dcdee7d960e87bda980e3d6e646e22149208dad
CRs-Fixed: 2359334
diff --git a/Kbuild b/Kbuild
index fe1f398..5d5d190 100644
--- a/Kbuild
+++ b/Kbuild
@@ -575,9 +575,11 @@
 endif
 
 ifeq ($(CONFIG_QDF_TEST), y)
+	QDF_OBJS += $(QDF_TEST_OBJ_DIR)/qdf_hashtable_test.o
 	QDF_OBJS += $(QDF_TEST_OBJ_DIR)/qdf_types_test.o
 endif
 
+cppflags-$(CONFIG_QDF_TEST) += -DWLAN_HASHTABLE_TEST
 cppflags-$(CONFIG_QDF_TEST) += -DWLAN_TYPES_TEST
 
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