clk: renesas: rzg2l: Add helper for mod clock enable/disable

clk: renesas: rzg2l: Add helper for mod clock enable/disable

Refactor rzg2l_mod_clock_endisable() by extracting its logic into a new
helper function rzg2l_mod_clock_endisable_helper(), which accepts an
additional set_mstop_state boolean parameter.  This allows callers to
control whether the module stop state is updated alongside the clock
enable/disable operation.  No functional change for existing callers.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260324114329.268249-5-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>