Remove unnecessary Android.mk in device/google/tangorpro

After verification, the top-level Android.mk only includes the
Android.mk of its subdirectories. The only meaningful build target
in the subdirectory is `UwbVendorService`, but it is blocked by the
blank Android.mk in the upper layer and can never be built.
Therefore, all Android.mk in device/google/tangorpro are not necessary
to exist in reality.

Bug: 311511817
Test: N/A
Change-Id: I3c47169481cedc6a23e94a0d3d96bd2a644abe2a

Android.mk

@@ -1,30 +0,0 @@
-#
-# Copyright (C) 2021 The Android Open-Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-# WARNING: Everything listed here will be built on ALL platforms,
-# including x86, the universal, and the SDK.  Modules must be uniquely
-# named (liblights.panda), and must build everywhere, or limit themselves
-# to only building on ARM if they include assembly. Individual makefiles
-# are responsible for having their own logic, for fine-grained control.
-
-LOCAL_PATH := $(call my-dir)
-
-# if some modules are built directly from this directory (not subdirectories),
-# their rules should be written here.
-
-ifneq (,$(filter $(TARGET_DEVICE),tangorpro))
-  include $(call all-makefiles-under,$(LOCAL_PATH))
-endif