The base of the range of ITS file identifiers for secure element driver persistent data. We use a slice of the implementation reserved range 0xffff0000..0xffffffff, specifically the range 0xfffffe00..0xfffffeff. The length of this range drives the value of #PSA_MAX_SE_LOCATION. The identifier 0xfffffe00 is actually not used since it corresponds to #PSA_KEY_LOCATION_LOCAL_STORAGE which doesn't have a driver.