[IMP] point_of_sale: Refactoring the "build" of the IoT Box

The use of an emulator (qemu) for the IoT Box build posed compatibility and performance issues.
So we have the Raspbian filesystem to install and configure packages.

closes odoo/odoo#40967

Task: 2145445
X-original-commit: 9c4e23a6
Signed-off-by: Quentin Lejeune (qle) <qle@odoo.com>