Hash calculation fails if MCUBOOT_HASH_STORAGE_DIRECTLY is used and NVM does not start at 0x0 #2368
Description
If the MCUBOOT_HASH_STORAGE_DIRECTLY option is enabled and the NVM memory does not start at 0x0, then casting the value returned by the flash_area_get_off(fap) to void * results in going through a different memory region than expected (and possible cause faults).
Since flash area already has a dedicated function to get the base address for the offsets (flash_device_base), it may be used to fix the address calculation and allow to use MCUBOOT_HASH_STORAGE_DIRECTLY on such platforms.