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There are several SoCs (e.g. rk3228h and rk3328) that integrated with Inno USB3 PHY, they can't toggle CP test pattern when do USB3 compliance test by default. This patch add a cp_test callback for USB3 controller to enable the special USB3 PHY to toggle the CP test pattern. Change-Id: I2d603202723a4c044d4231af10cfe2c60ec0e988 Signed-off-by: William Wu <wulf@rock-chips.com>