dcd_ci_fs: disarm sibling BDT on short-packet OUT completion

A multi-packet OUT transfer speculatively arms both even/odd BDTs to avoid
NAK. When the host ends the transfer early with a short packet, the sibling
BDT was left armed (own=1), desyncing the even/odd ping-pong so the next OUT
packet landed at buffer+max_packet_size instead of buffer and the stack read
stale data. Disarm the sibling on completion.

Fixes device/mtp on Kinetis (GetDeviceInfo command was received into the wrong
buffer half -> hang). Pre-existing (MSC only arms single-packet command
receives so it never hit the double-buffer path). HIL: frdm_kl25z & frdm_k64f
device 13/13.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
Claude-Session: https://claude.ai/code/session_01ExGPLP5eU43LR7o6yYLpNi

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