media: renesas: vsp1: histo: Fix format setting

The histogram .set_fmt() handler suffers from two problems:

- When operating on the source pad, it returns correct information to
  userspace, but does not store the format in the subdev state.
  Subsequent calls to .get_fmt(), handled by the
  vsp1_subdev_get_pad_format() helper, will not return the correct
  information.

- When operating on the sink pad, it uses the
  vsp1_subdev_set_pad_format(), which propagates the sink format to the
  source, incorrectly overwriting the fixed source format.

The first issue could be fixed by implementing the set format operation
with vsp1_subdev_get_pad_format() on the source pad, if it wasn't that
.set_fmt() is also used to initialize the subdev state in
vsp1_entity_init_state(). The histogram would need a custom
.init_state() handler.

As the second issue would anyway overwrite the format, and therefore
requires a custom .set_fmt() implementation, fix both issues without
using the helpers.

Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # HiHope RZ/G2M
Link: https://patch.msgid.link/20260318235907.831556-12-laurent.pinchart+renesas@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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