mynewt: Add support for MCUBOOT_SINGLE_APPLICATION_SLOT #1933
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So far mynewt code required definition of second slot in bsp. Even in cases when overwrite only option was used bsp had to have secondary slot with 0 length or pointing to some unreachable flash or flash area.
Now when BOOTUTIL_SINGLE_APPLICATION_SLOT is set to 1 there is not need for fake flash areas when mcuboot provides way for upgrade like boot serial or other supported ways (USB DFU or USB MSC)