refine product make scripts

- allow enable overlayfs data partiton
- stub to extend product definition
- auto detect GPU

init.redroid.rc

@@ -1,14 +1,28 @@
 on early-init
+    mount debugfs debugfs /sys/kernel/debug mode=755
+
     mount none /system/etc /etc bind rec  # docker fix
     mount sysfs sysfs /sys rw remount  # ueventd fix
 
+    # inputflinger require this dir
+    mkdir /dev/input
+
+    exec - root root -- /vendor/bin/gpu_config.sh
+
+
+# setup overlay data partition
+on early-init && property:ro.kernel.redroid.overlay=1
+    mkdir /data-diff/upper
+    rmdir /data-diff/work
+    mkdir /data-diff/work
+
+    mount overlay overlay /data lowerdir=/data-base,upperdir=/data-diff/upper,workdir=/data-diff/work
+
+
+on init
     write /data/.empty 0
     mount none /data/.empty /proc/vmallocinfo bind # lxcfs?
 
-    # fix for WSL2
-    mkdir /dev/input
-
-    setprop gralloc.gbm.device /dev/dri/renderD128
 
 on post-fs-data
     # fix for static IP, must after post-fs-data and before netd