[Reg 5.15.2 -> 5.15.3] Nvidia Jetson TX2 image size is over 30 GB (was 3,61 GB in 5.15.2)

The unzipped b2qt-embedded-qt5-image-jetson-tx2.img is 30.1 GB compared to 3,61 GB in Qt 5.15.2. The other targets' (apallis-imx6, colibri-imx7, intel nuc) image sizes are approximately the same than in Qt 5.15.2. Only Nvidia Jetson TX2 has this problem.

after discussion with Samuli, the other target devices minimum sizes will be increased from 2 GB to 4 GB