As recommended in cmake/app/boilerplate.cmake, ZEPHYR_BASE should
be preferred to PROJECT_SOURCE_DIR.
Do the change for all boards still referring to PROJECT_SOURCE_DIR.
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>
The AN521 is a Soft Macro Model implementation of the SSE-200 subsystem
with SIE-200 and CMSDK components targeting the MPS2+ board. The
SSE-200 subsystem implements two Cortex-M33 cores.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
Signed-off-by: Karl Zhang <karl.zhang@linaro.org>