dwc3: Add required support to get lfps_rxterm interrupt from SS_PHY

lfps_rxterm interrupt is not seen on attaching USB super speed device when
USB is into LPM with USB host mode without device attach case. This change
fixes below issues to get lfps_rxterm interrupt to resume USB.
1. Correct polarity of lfps rxterm interrupt from edge trigger to level
trigger
2. Notify USB SS PHY driver about USB host cable status to allow required
configuration while USB SS PHY is being suspended.
3. Also it is required to clear ALFPS_DTCT_EN and set ARCVR_DTCT_EVENT_SEL
when USB SS PHY is being suspended with host cable connected case to detect
next super speed device attach condition using lfps_rxterm interrupt.

Change-Id: Ia763ec6b742ca681e71454d29f866009add56c52
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>