Remove empty Android.mk files for 3 test projects

Removing empty intermediate Android.mk files for vehicle, tv cec, and tv input vts test projects.
Replaced with direct pointing to the Android.mk file under functional/vts/testcases/hal

Test: make vts
Change-Id: I64a0a7c236f2ef6a2019cbde3b93ac2324df3752
diff --git a/vehicle/2.0/vts/Android.mk b/vehicle/2.0/vts/Android.mk
index df5dac8..31fa999 100644
--- a/vehicle/2.0/vts/Android.mk
+++ b/vehicle/2.0/vts/Android.mk
@@ -16,4 +16,4 @@
 
 LOCAL_PATH := $(call my-dir)
 
-include $(call all-subdir-makefiles)
\ No newline at end of file
+include $(LOCAL_PATH)/functional/vts/testcases/hal/vehicle/hidl/Android.mk
\ No newline at end of file