phy: rockchip: naneng-combphy: Use signal from comb PHY on RK3588

Route signal from comb PHY instead of PCIe3 PHY to PCIe1l0 and PCIe1l1.

Fixes use of pcie2x1l0 on ROCK 5B.

Code imported from mainline linux driver.

Fixes: c5b4a012 ("phy: rockchip: naneng-combphy: Support rk3588")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>