phy: rockchip: naneng-combphy: Add SoC prefix to register definitions

phy: rockchip: naneng-combphy: Add SoC prefix to register definitions

All supported variants of naneng-combphy follow a register layout
similar to the RK3568 variant with some exceptions of SoC-specific
registers.

Add RK3568 prefix for the common set of registers and the corresponding
SoC prefix for SoC-specific registers, making usage of definitions clear
and preparing for future COMBPHY variants with a different register
layout.

Signed-off-by: Yao Zi <ziyao@disroot.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250728102947.38984-6-ziyao@disroot.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>