If setting the MBEDTLS_PLATFORM_NV_SEED_ALT and MBEDTLS_ENTROPY_NV_SEED flags and not
setting MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO and MBEDTLS_PLATFORM_NV_SEED_READ_MACRO flags
mbed-os will add an entropy source to the relevent partition - SPE in case of daul core or
in case of single core V7 to the main partition.
The defualt behaviour will be to read or write the data from the ITS.