feat: arm64: mmu: auto-sensing of best paging stride

Improves the memory mapping process by dynamically selecting the optimal
paging stride (4K or 2M) based on virtual address alignment and mapping
size. This eliminates the need for upfront stride determination, enhancing
flexibility and maintainability in memory management.

Changes:
- Replaced fixed stride selection logic with a dynamic decision loop.
- Removed `npages` calculation and replaced with `remaining_sz` to track
  unprocessed memory size.
- Added assertions to ensure `size` is properly aligned to the smallest
  page size.
- Adjusted loop to dynamically determine and apply the appropriate stride
  (4K or 2M) for each mapping iteration.
- Updated virtual and physical address increments to use the dynamically
  selected stride.

Signed-off-by: Shell <[email protected]>

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