[crypto] Rework AES CTR/XTS streaming and squash heap churn (#2782)

AES Updates:
Replaced heap churn with stack scratch buffers tail handling now stays in-place, no more recursive transcode detours.
CTR/XTS modes read in larger, aligned chunks and still handle odd offsets cleanly.
XTS prefetches a few sectors ahead to reduce extra reads.
AesCtrStorage writer now uses the pooled buffer properly one stack slab, chunk forward, bump counter, repeat.
Result: less malloc noise, fewer watchdog spikes at startup (though mbedtls still sets the pace).
This should make the loading speed slightly better than before. Make sure to test.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2782
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: crueter <crueter@eden-emu.dev>
Co-authored-by: godpow <thesaviorsrule@yahoo.com>
Co-committed-by: godpow <thesaviorsrule@yahoo.com>

0 files changed, 0 insertions, 0 deletions