[Armbian build PR] - clean: remove unused code, replaced df with findmnt

[RSS Bot]

Description

Clear the code for system scripts:

• /etc/kernel/postrm.d/xx-initramfs-cleanup
• /etc/kernel/postinst.d/xx-initramfs-cleanup

Split Pull Request [#4691]

Checklist:

• [x] Tested on the bananapim64 device of the jammy OS
• [ ] Test on a device with a separate partition /boot OS debian

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