Add basic support ro.build.version.release_or_codename

Currently no different from "release". Will be updated to differ
in a follow up change, once all related issues have been resolved.

Bug:  143175463
Test: manual

Change-Id: I2e7de023d49cb1dcb83637e2c9af5a3e48e46f7d
diff --git a/core/Makefile b/core/Makefile
index c862e97..7cd055e 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -242,6 +242,7 @@
 	DATE="$(DATE_FROM_FILE)" \
 	PLATFORM_SDK_VERSION="$(PLATFORM_SDK_VERSION)" \
 	PLATFORM_VERSION="$(PLATFORM_VERSION)" \
+	PLATFORM_VERSION_LAST_STABLE="$(PLATFORM_VERSION)" \
 	TARGET_BUILD_TYPE="$(TARGET_BUILD_VARIANT)" \
 	bash $(BUILDINFO_COMMON_SH) "$(1)" >> $(2)
 endef
@@ -446,6 +447,7 @@
 	        BUILD_NUMBER="$(BUILD_NUMBER_FROM_FILE)" \
 	        BOARD_BUILD_SYSTEM_ROOT_IMAGE="$(BOARD_BUILD_SYSTEM_ROOT_IMAGE)" \
 	        PLATFORM_VERSION="$(PLATFORM_VERSION)" \
+	        PLATFORM_VERSION_LAST_STABLE="$(PLATFORM_VERSION)" \
 	        PLATFORM_SECURITY_PATCH="$(PLATFORM_SECURITY_PATCH)" \
 	        PLATFORM_BASE_OS="$(PLATFORM_BASE_OS)" \
 	        PLATFORM_SDK_VERSION="$(PLATFORM_SDK_VERSION)" \