Switching to CMake build caused some failures due to the fact that:
- binary objects in tf-psa-crypto are not in the same location as before;
- header files from "<mbedtls-root>/include" are no more included when
building tf-psa-crypto ojects.
This commit fixes both problems.
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>