sm8550-common: Generate non-HLOS image mount points for A/B builds

* On builds where A/B support is enabled the system image
   acts as the rootfs. In this case we can no longer create
   the non-HLOS image mount points at run time as we used
   to, we now create them as part of the build itself.

Change-Id: I30d98f7c50fca3ce7117b9b8d87150655bb5b440

Android.mk

@@ -0,0 +1,33 @@
+#
+# Copyright (C) 2023 The LineageOS Project
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+LOCAL_PATH := $(call my-dir)
+
+ifneq ($(filter dm1q dm2q dm3q,$(TARGET_DEVICE)),)
+
+# A/B builds require us to create the mount points at compile time.
+# Just creating it for all cases since it does not hurt.
+FIRMWARE_MOUNT_POINT := $(TARGET_OUT_VENDOR)/firmware_mnt
+$(FIRMWARE_MOUNT_POINT): $(LOCAL_INSTALLED_MODULE)
+	@echo "Creating $(FIRMWARE_MOUNT_POINT)"
+	@mkdir -p $(TARGET_OUT_VENDOR)/firmware_mnt
+
+BT_FIRMWARE_MOUNT_POINT := $(TARGET_OUT_VENDOR)/bt_firmware
+$(BT_FIRMWARE_MOUNT_POINT): $(LOCAL_INSTALLED_MODULE)
+	@echo "Creating $(BT_FIRMWARE_MOUNT_POINT)"
+	@mkdir -p $(TARGET_OUT_VENDOR)/bt_firmware
+
+DSP_MOUNT_POINT := $(TARGET_OUT_VENDOR)/dsp
+$(DSP_MOUNT_POINT): $(LOCAL_INSTALLED_MODULE)
+	@echo "Creating $(DSP_MOUNT_POINT)"
+	@mkdir -p $(TARGET_OUT_VENDOR)/dsp
+
+ALL_DEFAULT_INSTALLED_MODULES += \
+    $(FIRMWARE_MOUNT_POINT) \
+    $(BT_FIRMWARE_MOUNT_POINT) \
+    $(DSP_MOUNT_POINT)
+
+endif