TF-M will uses SPU alignment during build time to make sure all
partitions can be locked down with the SPU.

So adding them for nRF53

Signed-off-by: Markus Swarowsky <markus.swarowsky@nordicsemi.no>
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
(cherry picked from commit 90826581f1ee32b99f1cafdffc2e634a495d8ee3)