iopsys-econet: Add loopdev and mtd_cmd to kernel

Bartlomiej Grzeskowiakrequested to merge
bg_add_kernel_config into devel

Add loopdev and mtd command parser to kernel.

@AGnau please review

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

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