Older versions of mcuboot did not support swap using move and therefore
the build would have failed CONFIG_MCUBOOT_SWAP_USING_MOVE=y.
Newer mcuboot contains initial support of swap using move for NuttX. Also
Makefile was updated to as some bootutil files were removed from mcuboot.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>