fatfs: optional AES-256-XTS full-disk encryption hook#105
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Gated by AP_FATFS_CRYPTO_ENABLED (set in a board hwdef; reaches this file via ffconf.h -> hwdef.h). When enabled, sectors are decrypted in place after blkRead and encrypted into a bounded scratch buffer before blkWrite, calling the AP_DiskCrypto shim provided by ArduPilot. Excluded from the bootloader. No functional change when disabled.
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Adds an optional encryption hook to the FatFS diskio binding, gated by
AP_FATFS_CRYPTO_ENABLED(set in a board hwdef).When enabled, sectors are decrypted in place after
blkReadand encrypted into a bounded scratch buffer beforeblkWrite, calling theap_diskcrypto_*shim provided by ArduPilot's AP_DiskCrypto library.