Merge changes from topic "from-pi-gsi" into pie-gsi

* changes:
  Fix loading ueventd.${ro.hardware}.rc.
  ueventd: let scripts provide firmware directories
  Add /mnt/product rw mount point for product partitions.
  fs_mg: allow getting VBMeta Digest from device-tree
  fs_mgr: avb should use built-in kernel command line parser