Disable OEMCrypto tests that install a test keybox.

Because we do not want to accidentally install a test keybox on a
production device, most of the oemcrypto unit tests are being disabled
by default.

If you wish to run these tests, you can override this choice, by
running:
adb shell /system/bin/oemcrypto_test --gtest_also_run_disabled_tests

This change prompts for and requires positive confirmation before
running the disabled tests on a device that has a non-test keybox
already installed.

Bug: 8907626

Merge of https://widevine-internal-review.googlesource.com/#/c/5531/
from the Widevine CDM repository

Change-Id: Ib8e3605129ebf0861b4af15d04676f7a06cc5b78

libwvdrmengine/oemcrypto/test/Android.mk

@@ -4,8 +4,7 @@ LOCAL_PATH:= $(call my-dir)
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES:= \
-  oemcrypto_test.cpp \
-  oemcrypto_keybox_test.cpp
+  oemcrypto_test.cpp
 
 LOCAL_MODULE_TAGS := tests