Revert "Add the cts-platform-version check"

Revert submission 15776724-rewrite cts-platform-version-check module

Reason for revert: merge conflicts with sc-dev-plus-aosp
Reverted Changes:
I7d018d2b3:Remove os/Android.mk
I613ac5b50:Add the cts-platform-version check

Change-Id: Ic4a9c58c46ffadb5fcaadd1649e54a9fa2a69285
diff --git a/core/tasks/cts.mk b/core/tasks/cts.mk
index dccf14f..fdd9591 100644
--- a/core/tasks/cts.mk
+++ b/core/tasks/cts.mk
@@ -25,35 +25,3 @@
 
 .PHONY: cts_v2
 cts_v2: cts
-
-# platform version check (b/32056228)
-# ============================================================
-ifneq (,$(wildcard cts/))
-  cts_platform_version_path := cts/tests/tests/os/assets/platform_versions.txt
-  cts_platform_version_string := $(shell cat $(cts_platform_version_path))
-  cts_platform_release_path := cts/tests/tests/os/assets/platform_releases.txt
-  cts_platform_release_string := $(shell cat $(cts_platform_release_path))
-
-  ifeq (,$(findstring $(PLATFORM_VERSION),$(cts_platform_version_string)))
-    define error_msg
-      ============================================================
-      Could not find version "$(PLATFORM_VERSION)" in CTS platform version file:
-      $(cts_platform_version_path)
-      Most likely PLATFORM_VERSION in build/core/version_defaults.mk
-      has changed and a new version must be added to this CTS file.
-      ============================================================
-    endef
-    $(error $(error_msg))
-  endif
-  ifeq (,$(findstring $(PLATFORM_VERSION_LAST_STABLE),$(cts_platform_release_string)))
-    define error_msg
-      ============================================================
-      Could not find version "$(PLATFORM_VERSION_LAST_STABLE)" in CTS platform release file:
-      $(cts_platform_release_path)
-      Most likely PLATFORM_VERSION_LAST_STABLE in build/core/version_defaults.mk
-      has changed and a new version must be added to this CTS file.
-      ============================================================
-    endef
-    $(error $(error_msg))
-  endif
-endif