clk: renesas: rzv2h: Update error message

clk: renesas: rzv2h: Update error message

Update the error message in `rzv2h_mod_clock_endisable()` to provide
clearer debugging information. Instead of printing only the register
address, include both the `GET_CLK_ON_OFFSET(reg)` offset and the
corresponding `clk` name (`%pC`). This enhances readability and aids
in debugging clock enable failures.

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/20250211105603.195905-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>