land: Consider lineage_land product via the AOSP way

Change-Id: Iab7b6c4d2817af88a133945df8fcc7fb964e35e9

AndroidProducts.mk

@@ -0,0 +1,17 @@
+#
+# Copyright (C) 2018 The LineageOS Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+PRODUCT_MAKEFILES := \
+    $(LOCAL_DIR)/lineage_land.mk