Add devices suitable for single-arch module builds

Prior to this the generic_* devices were typically used for this
purpose. There are a few reasons to create new specific ones:
- the generic_arm64 device has a hack specifically for building
  multi-arch packages that we want to avoid
- the generic_* devices include a bunch of emulator config that does not
  make sense for unbundled builds

Bug: 172256440
Test: verify unbundled builds migrated from generic_* don't change
Change-Id: Ia937461aa24a5d5b542f8688a1b71ac3fdeb596b
diff --git a/target/board/module_arm/BoardConfig.mk b/target/board/module_arm/BoardConfig.mk
new file mode 100644
index 0000000..565efc8
--- /dev/null
+++ b/target/board/module_arm/BoardConfig.mk
@@ -0,0 +1,20 @@
+# Copyright (C) 2020 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 := arm
+TARGET_ARCH_VARIANT := armv7-a-neon
+TARGET_CPU_VARIANT := generic
+TARGET_CPU_ABI := armeabi-v7a
+TARGET_CPU_ABI2 := armeabi