Fixes to make autocalibrate work on linux 3.14.52 armv7l#5

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Commits on Apr 24, 2016

Command handler plt_tx_bip() stored nvs_path on stack and send
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Delay of 1.5 sec added after insmod() call in plt_autocalibrate()
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Maximal size of nvs file is sometimes given by number and sometimes
tom-van
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