Build: Enable nested macros for image script

This change enables the usage of nested macros in flash_layout.h
for setting the offset and max size for secure and non-secure images.

Change-Id: I87e2aec67550debb4d36286ed46bfe935a9003c8
Signed-off-by: Sverteczky, Marcell <marcell.sverteczky@arm.com>
4 files changed