dt-bindings: clock: renesas,r9a09g057-cpg: Add USB2 PHY and GBETH PTP core clocks

dt-bindings: clock: renesas,r9a09g057-cpg: Add USB2 PHY and GBETH PTP core clocks

Add definitions for USB2 PHY core clocks and Gigabit Ethernet PTP
reference core clocks in the R9A09G057 CPG DT bindings header file.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250407165202.197570-8-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>