Revert "mvebu: fix initramfs/kernel image for CZNIC Turris Omnia"

Revert "mvebu: fix initramfs/kernel image for CZNIC Turris Omnia"

This reverts commit e401a2a42e6d7c892e1cf7d765fa5ec9b2db3fb3 as at least
two users had reported breakage on their devices.

References: https://lists.infradead.org/pipermail/openwrt-devel/2020-December/032837.html
References: https://github.com/openwrt/openwrt/commit/e401a2a42e6d7c892e1cf7d765fa5ec9b2db3fb3#commitcomment-45189788
Cc: Karel Kočí <[email protected]>
Reported-by: Magnus Kroken <[email protected]>
Signed-off-by: Petr Štetiar <[email protected]>