Add a mainline arm64 device

The existing 'generic' targets are emulator devices, and targeting
it has the side-effect of including emulator-specific artifacts.

Create a mainline device instead, which is really generic. This also
allows specifying tweaks unsuitable for the emulator.

Include BoardConfigGsiCommon for now, even though it includes a few
things we likely won't want in the future.

Bug: 80410283
Bug: 111538404
Test: lunch mainline_arm64; m
Change-Id: I15e7cb41fcbd3c0592a091ba7a8575ddf10bda71

target/board/BoardConfigEmuCommon.mk

@@ -3,10 +3,6 @@
 # Common compile-time definitions for emulator
 #
 
-# The generic product target doesn't have any hardware-specific pieces.
-TARGET_NO_BOOTLOADER := true
-TARGET_NO_KERNEL := true
-
 HAVE_HTC_AUDIO_DRIVER := true
 BOARD_USES_GENERIC_AUDIO := true
 TARGET_BOOTLOADER_BOARD_NAME := goldfish_$(TARGET_ARCH)

target/board/BoardConfigGsiCommon.mk

@@ -3,6 +3,10 @@
 # Common compile-time definitions for GSI
 #
 
+# The generic product target doesn't have any hardware-specific pieces.
+TARGET_NO_BOOTLOADER := true
+TARGET_NO_KERNEL := true
+
 # GSIs always use ext4.
 TARGET_USERIMAGES_USE_EXT4 := true
 # GSIs are historically released in sparse format.

target/board/mainline_arm64/BoardConfig.mk

@@ -0,0 +1,27 @@
+# Copyright (C) 2018 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.
+#
+
+TARGET_ARCH := arm64
+TARGET_ARCH_VARIANT := armv8-a
+TARGET_CPU_VARIANT := generic
+TARGET_CPU_ABI := arm64-v8a
+
+TARGET_2ND_ARCH := arm
+TARGET_2ND_ARCH_VARIANT := armv8-a
+TARGET_2ND_CPU_ABI := armeabi-v7a
+TARGET_2ND_CPU_ABI2 := armeabi
+TARGET_2ND_CPU_VARIANT := generic
+
+include build/make/target/board/BoardConfigGsiCommon.mk

target/product/mainline_system_arm64.mk

@@ -18,6 +18,6 @@ $(call inherit-product, $(SRC_TARGET_DIR)/product/core_64_bit.mk)
 $(call inherit-product, $(SRC_TARGET_DIR)/product/mainline_system.mk)
 
 PRODUCT_NAME := mainline_system_arm64
-PRODUCT_DEVICE := generic_arm64
+PRODUCT_DEVICE := mainline_arm64
 PRODUCT_BRAND := generic
 PRODUCT_SHIPPING_API_LEVEL := 28