phy: rockchip-inno-usb2: Limit changes made to regs

The USB2PHY regs already contain working default reset values for RK3328
and RK35xx as evidenced by the fact that this driver never has changed a
single value for these SoCs.

Reduce to only configure utmi_suspend_n and utmi_sel bits similar to
what is currently done on RK3399. Also add missing clkout_ctl for RK3588.

When enabled utmi_suspend_n is changed to normal mode and utmi_sel to
use otg/host controller utmi interface to phy. When disabled
utmi_suspend_n is changed to suspend mode and utmi_sel to use GRF utmi
interface to phy.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>