iopsys-econt: Add overlay support for mtd_squashfs layout

Bartlomiej Grzeskowiakrequested to merge
bg_add_mtdsquash_overlay into devel

@AGnau @sukrus @Marek @LukaszK

mtd_squashfs layout is used to workaround nand flash issues on some lash chips. Overlay in Ubi support is added also to this configuration.

Signed-off-by: Bartlomiej Grzeskowiak bartlomiej.grzeskowiak@iopsys.eu

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