For rk1808 platform, when system enters deep sleep,
it doesn't need usb3 phy to detect any signals, so
we can disable lane 0 to reduce power consumption.
With this patch, I test the 0.8V and 1.8V power
consumption for USB 3.0 mode while system enters
deep sleep on RK1808-EVB.
- 0.8V : 3.5mA
- 1.8V : 0.3mA
Change-Id: I2c080b2787e5358c7495b9a237d0d2b338cc145e
Signed-off-by: William Wu <william.wu@rock-chips.com>