fix(build): sp_layout gen for concurrent builds

Move renaming of the primary dts file for ivy partitions according
to if the shim is present out of the if else so it always occurs.

Signed-off-by: Daniel Boulby <daniel.boulby@arm.com>
Change-Id: Ib018e7bc9872520921fe7c7684ec968cbe786d52
1 file changed