ahci: WIP - refactor AHCI command engine, fix PRDT setup and LBA logic

This patch begins a major cleanup and enhancement of AHCI I/O handling:

- Refactored AHCI command setup logic to prepare FIS and PRDT entries more correctly.
- Fixed miscalculation of 48-bit LBA extraction from IDENTIFY response.
- Rewrote PRDT loop to increment physical address per entry instead of recomputing offsets.
- Replaced read/write/identify branching with unified ternary logic for clarity.
- Ensured proper stopping and reinitialization of command engine before issuing commands.
- Explicitly remap and zero command list base, FIS base, and command table areas.
- Made command slot lookup more robust.
- Added fallback wait after command completion to avoid SRBSY/SRDRQ residue.
- Dropped misused `YES` flag in read/write call sites — now passed only when needed.

Also includes:
- Minor cleanup in `BootKit.h` (whitespace).
- NeFS debug message clarified to avoid accidental fork overwrites.

This is a **work-in-progress** rework of the AHCI path. Next steps will involve:
- More robust error recovery.
- Support for non-512 sector drives.
- Support for multiple ports and NCQ.

Signed-off-by: Amlal El Mahrouss <amlal@nekernel.org>

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