Auto detect possible use of legacy props

* Revert: Make legacy props an option disabled by default
  (reverted from commit 75aa615767457f2b62dda65b16ded41b0e6df11f)

* Instead check for ANDROID_PROPERTY_WORKSPACE in the updater-
  binary to determine whether legacy property service can be
  used

Change-Id: If68d5cca9a2b56edcb1c73db0474668cf46d8c91
diff --git a/data.cpp b/data.cpp
index 5a90553..c0cb9b8 100644
--- a/data.cpp
+++ b/data.cpp
@@ -833,20 +833,19 @@
 #else
 	mConst.SetValue("tw_has_boot_slots", "0");
 #endif
+
 #ifdef TW_NO_LEGACY_PROPS
 	LOGINFO("TW_NO_LEGACY_PROPS := true\n");
-	mConst.SetValue("tw_enable_legacy_props", "0");
 #endif
+
 #ifdef TW_OEM_BUILD
 	LOGINFO("TW_OEM_BUILD := true\n");
 	mConst.SetValue("tw_oem_build", "1");
-	mConst.SetValue("tw_enable_legacy_props", "0");
 #else
 	mConst.SetValue("tw_oem_build", "0");
 	mPersist.SetValue("tw_app_prompt", "1");
 	mPersist.SetValue("tw_app_install_system", "1");
 	mData.SetValue("tw_app_install_status", "0"); // 0 = no status, 1 = not installed, 2 = already installed
-	mPersist.SetValue("tw_enable_legacy_props", "0");
 #endif
 
 	pthread_mutex_unlock(&m_valuesLock);