DISCO_H747I - define default storage (TDB_INTERNAL)
DISCO_H747I - define default storage (TDB_INTERNAL)

DeviceKey needs the definition of the default storage place,
define it to be TDB_INTERNAL (as for the other boards).

kjbracey-arm/mbed,andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os,andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os,mbedmicro/mbed,kjbracey-arm/mbed,kjbracey-arm/mbed,mbedmicro/mbed,kjbracey-arm/mbed,andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os