soc: rt11xx: Enabled multicore support with second image

RT11xx features CM4 core, which must be booted from CM7 core. Add
support for loading an image for the CM4 to RAM, and booting the CM4 core
from this image. Each image is built independently using sysbuild, and the
M4 image build produces built collateral with load address information the
M7 image can use to load it to RAM

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>