power: smb5: update VCONN control for PMI632 based platform

PMI632 based platform does not support PD, thus keep VCONN
control(enable/disable) in hardware mode(charger hardware
will automatically turn-on VCONN for typeC cable with Ra
present on one of the CC line).

Change-Id: I064ec1dac368ee481229880b8909a15cc5dfaeaa
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>