docs(rd1ae): update documentation to include BL32

Update the boot sequence in the RD-1 AE documentation
to include BL32 (OP-TEE).

Signed-off-by: Ziad Elhanafy <ziad.elhanafy@arm.com>
Change-Id: I25fdc114bb71d3ad7e1bb2d845f758d6af037e3d
1 file changed