Convert tests/**/Android.mk files to Android.bp

See build/soong/README.md for more information.

Note: tests/ImfTest/Android.mk causes conflict as it hasn't been yet
ported to internal master. Do it later.
Note: the conversion in the following directories has to be done in the
internal master first because of the conflicts:
* tests/ActivityManagerPerfTests
* tests/AppLaunch
* tests/AppLaunchWear
* tests/BackgroundDexOptServiceIntegrationTests
* tests/Camera2Tests/CameraToo
* tests/Camera2Tests/SmartCamera/SimpleCamera
* tests/Compatibility
* tests/Internal
* tests/RcsTests
* tests/ServiceCrashTest
* tests/UsbTests

Bug: 122332340
Test: treehugger
Change-Id: Ie17590c6a96aee5caa80d38092a3de5c1b6efe8d

tests/SystemUIDemoModeController/Android.bp

@@ -0,0 +1,5 @@
+android_test {
+    name: "DemoModeController",
+    srcs: ["**/*.java"],
+    sdk_version: "current",
+}

tests/SystemUIDemoModeController/Android.mk

@@ -1,11 +0,0 @@
-LOCAL_PATH:= $(call my-dir)
-include $(CLEAR_VARS)
-
-LOCAL_MODULE_TAGS := tests
-
-LOCAL_SRC_FILES := $(call all-subdir-java-files)
-
-LOCAL_PACKAGE_NAME := DemoModeController
-LOCAL_SDK_VERSION := current
-
-include $(BUILD_PACKAGE)