dwc3-msm-core: Remove usage of DWC31_LINK_GDBGLTSSM with POR

USB SSPHY is still not initialized when reading DWC31_LINK_GDBGLTSSM
register (which is USB controller based LINK register, applicable for
USB SS only). This register read shall take more time which shall result
into other master read on CNOC seeing higher latency. Hence remove
usage of DWC31_LINK_GDBGLTSSM read as purpose to mark state as IN_P3
doesn't hold good here until USB PHYs are initialized.

Change-Id: Ic0f00e5f61e53feb71c8fa17cbfee06b6506efae
Signed-off-by: Mayank Rana <quic_mrana@quicinc.com>
Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com>
Signed-off-by: Krishna Kurapati <quic_kriskura@quicinc.com>