Add gsi_arm.mk product makefile

GSI product makefile for compliance GSI release.

Bug: 177495407
Test: lunch gsi_arm-userdebug && m
Test: lunch gsi_arm64-userdebug && m
Test: Boot with gsi_arm64 as system partition on bramble
Change-Id: Ida75e3715427f91153a4f0062cb70d3694dd9a81
diff --git a/AndroidProducts.mk b/AndroidProducts.mk
index 658333d..b002607 100644
--- a/AndroidProducts.mk
+++ b/AndroidProducts.mk
@@ -15,6 +15,7 @@
 #
 
 PRODUCT_MAKEFILES := \
+    $(LOCAL_DIR)/gsi_arm.mk \
     $(LOCAL_DIR)/gsi_arm64.mk \
     $(LOCAL_DIR)/gsi_x86.mk \
     $(LOCAL_DIR)/gsi_x86_64.mk \
diff --git a/gsi_arm.mk b/gsi_arm.mk
new file mode 100644
index 0000000..1a28cc8
--- /dev/null
+++ b/gsi_arm.mk
@@ -0,0 +1,51 @@
+#
+# Copyright (C) 2021 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# The system image of gsi_arm-userdebug is the GSI for devices with:
+# - ARM 32-bit userspace
+# - 64-bit binder interface
+# - system-as-root
+# - VNDK enforcement
+# - compatible property override enabled
+
+#
+# All components inherited here go to system image
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/generic_system.mk)
+
+# Enable mainline checking
+PRODUCT_ENFORCE_ARTIFACT_PATH_REQUIREMENTS := true
+
+#
+# All components inherited here go to system_ext image
+#
+$(call inherit-product, device/generic/common/gsi_system_ext.mk)
+
+#
+# All components inherited here go to product image
+#
+$(call inherit-product, device/generic/common/gsi_product.mk)
+
+#
+# Special settings for GSI releasing
+#
+$(call inherit-product, $(SRC_TARGET_DIR)/product/gsi_release.mk)
+
+
+PRODUCT_NAME := gsi_arm
+PRODUCT_DEVICE := generic
+PRODUCT_BRAND := Android
+PRODUCT_MODEL := GSI on ARM