MLECO-6380: Fix dependency chain

The Arm NPU delegate library needs to be built before other
libraries higher up in the chain. Although this dependency
was captured in CMake, using only the target file (and not
the CMake target itself) can cause issues with Makefile
generator. Adding this dependency explicitly fixes the
issue.

Change-Id: Iad5f9bfa01ebfe7413f2473dbbd043a13fbfc8fa
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>