clk: renesas: rzv2h: Add MSTOP support

clk: renesas: rzv2h: Add MSTOP support

Add MSTOP support to control buses for the individual units on RZ/V2H.
Use per-bit (instead of group-based) configuration and atomic counters,
to ensure precise control over individual MSTOP bits, and to prevent
issues with shared dependencies between module clocks.

Co-developed-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Co-developed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20241213123550.289193-2-biju.das.jz@bp.renesas.com
Link: https://lore.kernel.org/20250102181839.352599-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Link: https://lore.kernel.org/20250102181839.352599-3-prabhakar.mahadev-lad.rj@bp.renesas.com
Link: https://lore.kernel.org/20250102181839.352599-4-prabhakar.mahadev-lad.rj@bp.renesas.com
Link: https://lore.kernel.org/20250102181839.352599-5-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>