zephyr: fix _scs_relocate_vector_table build break
zephyr: fix _scs_relocate_vector_table build break

Zephyr now supports moving the vector table for Corext M* targets.
Let's remove this code from mcuboot as this has been changed
upstream and breaks mcuboot build.

Signed-off-by: Michael Scott <087571639a1dbb4ff1803c64e3643475ba482686@linaro.org>

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