RMX1971: overlay: Allow more cached apps in the background

* Google has provisioned this on the Pixel 5 (RQ1A.201205.010) to utilize the 8 GB of RAM better, and I have also observed that a lightweight selection of apps was hitting the cached app limit before exhausting RAM on another device with 8 GB of RAM
* This shouldn't cause adverse effects on devices with less RAM (e.g. 4 GB) as the low memory killer should kick in long before this limit on such devices

Signed-off-by: Dakkshesh <dakkshesh5@gmail.com>
Signed-off-by: kaderbava <ksbava7325@gmail.com>