fw_setenv: lock the flash only if it was locked before
With current implementation of fw_setenv, it is always locks u-boot-env region if lock interface is implemented for such mtd device. You can not control lock of this region with fw_setenv, there is no option for it in config or in application itself. Because of this situation may happen problems like in this thread on xilinx forum: https://forums.xilinx.com/t5/Embedded-Linux/Flash-be-locked-after-use-fw-setenv-from-user-space /td-p/1027851 A short summary of that link is: some person has issue with some spi chip which has lock interface but doesn't locks properly which leads to lock of whole flash memory on lock of u-boot-env region. As resulted solution hack was added into spi-nor.c driver for this chip with lock disablement. Instead fix this problem by adding logic to fw_setenv only lock the flash if it was already locked when we attempted to use it. Signed-off-by:Ivan Mikhaylov <fr0st61te@gmail.com>
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