clk: renesas: rzg2l: Fix typo in struct rzg2l_cpg_priv kerneldoc

clk: renesas: rzg2l: Fix typo in struct rzg2l_cpg_priv kerneldoc

Fix typo pll5_mux_dsi_div_params -> mux_dsi_div_params

Fixes the below warning (make W=1):

    drivers/clk/renesas/rzg2l-cpg.c:115: warning: Function parameter or member 'mux_dsi_div_params' not described in 'rzg2l_cpg_priv'

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20221026012123.159790-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>