RMX1971: prop: Compact cached app heaps in the background

* Background ART heap compaction for cached apps has been recommended for
  Android Go devices for a while, and Google has enabled it for the Pixel
  5 on RQ1A.201205.010. This feature should help fit more cached apps in
  memory.

[kalkioss] : Use prop instead of device config overlay.

Signed-off-by: improbir <ghosh_probir@yahoo.com>
Signed-off-by: kaderbava <ksbava7325@gmail.com>