media: renesas: rzg2l-cru: Fix typo in rzg3e_fifo_empty name

Correct the misnamed FIFO-empty helper for the RZ/G3E CRU. Rename
`rz3e_fifo_empty` to `rzg3e_fifo_empty` to match the intended
naming convention.

Reported-by: Biju Das <biju.das.jz@bp.renesas.com>
Closes: https://lore.kernel.org/all/TY3PR01MB11346E57A3DF8D8A90A405E4686812@TY3PR01MB11346.jpnprd01.prod.outlook.com/


Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Link: https://lore.kernel.org/r/20250429091609.9947-3-prabhakar.mahadev-lad.rj@bp.renesas.com


Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>