bootutil: Replace BUILD_ASSERT_MSG() with BUILD_ASSERT()
bootutil: Replace BUILD_ASSERT_MSG() with BUILD_ASSERT()

Replay of reverted to early committed patch 6d417c9:

Replace BUILD_ASSERT_MSG() with BUILD_ASSERT()
after merging BUILD_ASSERT() and BUILD_ASSERT_MSG().

Signed-off-by: Oleg Zhurakivskyy <cdb82bfa180f8df716a77d2c2557196a597a233c@intel.com>
Signed-off-by: Andrzej Puzdrowski <0222c24e1773dd88269ed0e559909ec9bea3604a@nordicsemi.no>

runtimeco/mcuboot,utzig/mcuboot,ATmobica/mcuboot,ATmobica/mcuboot,runtimeco/mcuboot,runtimeco/mcuboot,ATmobica/mcuboot,utzig/mcuboot,tamban01/mcuboot,utzig/mcuboot,utzig/mcuboot,runtimeco/mcuboot,utzig/mcuboot,tamban01/mcuboot,tamban01/mcuboot,tamban01/mcuboot,ATmobica/mcuboot,ATmobica/mcuboot,tamban01/mcuboot,runtimeco/mcuboot