linux-samsung-a5y17lte: add modules.order to package to fix build error

Its not been possible to build a postmarketos image for the Samsung A5Y17LTE with pmbootstrap as mkinitfs fails, this has been documented in a number of issues including #3737 (comment 483847) and postmarketos-mkinitfs#44 (closed). On analysis once the linux-samsung-a5y17lte apk is installed it then installs kmod apk which has a trigger script that checks for the file modules.order, if it isn't present it deletes a number of files which then has a knock on effect which results in mkinifs failing which causes the whole build to fail.

This MR creates an empty modules.order in the package which is enough to stop the deletion of all the other files by the kmod trigger script.