power: smb5: Fix VCONN orientation under SW control

SW is selected in the driver as the source to enable VCONN. However,
Its orientation, i.e., on the CC pin which has Ra connected, is not
explicitly specified when enabled and hence always defaulted to CC1.
This is incorrect since it may shift and is always opposite to CC
orientation.

Fix it.

Change-Id: Ibd74c12b25bfb45e0fecc48995e8a26379f98ea0
Signed-off-by: Harry Yang <harryy@codeaurora.org>