usb: misc: Add USB super speed re-driver support for QRD8150

Due to USB sub board design on QRD8150, we use TypeC redrive
chipset to improve signal quality for USB3.1 Gen2 up to 10Gbps.

Different board level designs may need to use different parameters,
so expose four interfaces under /sys/kerne/debug for the tuning,
that is eq, flat_gain, output_comp and loss_match.

Change-Id: Ia662fec69063cb676b0511486d09b4cffa57e25a
Signed-off-by: Liangliang Lu <luliang@codeaurora.org>