mtmd: fix Granite4 Vision image sequence assembly (#26653)

mtmd: fix Granite4 Vision image sequence assembly (#26653)

* mtmd: fix granite 4v grid assembly

(cherry picked from commit 91f82eb1b489bff0dc3f649edf2cb9e0b7f656e9)

* mtmd: fix truncation for scaled image height and width before unpad

Signed-off-by: Hemanth Battu <redacted>
* mtmd: remove MTMD_DUMP_EMBD debug scaffolding

Signed-off-by: Hemanth Battu <redacted>
* clean up comments, clarify about anyres_info excluded from serialization

* add_newline is now dead code

---------

Signed-off-by: Hemanth Battu <redacted>
Co-authored-by: Xuan Son Nguyen <redacted>
Co-authored-by: Hemanth Battu <redacted>