mfd: tmio: Remove obsolete .set_clk_div() callback

Commit bef64d2 ("mmc: remove tmio_mmc driver") removed the last
user of the .set_clk_div() callback in the tmio_mmc_data structure.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/e0fa98f138a7b2836128178f8b3a757978517307.1718897545.git.geert+renesas@glider.be
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Author: geertu

include/linux/mfd/tmio.h

@@ -101,7 +101,6 @@ struct tmio_mmc_data {
 	unsigned int			max_blk_count;
 	unsigned short			max_segs;
 	void (*set_pwr)(struct platform_device *host, int state);
-	void (*set_clk_div)(struct platform_device *host, int state);
 };
 
 /*