drivers: soc: qcom: terminate SBU lines when unused

Terminate SBU lines with high impedance when they are unused,
specifically at boot time and for non-DP use-cases. This is
required so that USB compliance test cases can be passed.

Change-Id: I42c6fedb784d0c2e113c5f4c69ac7ff100fc24e2
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>