power: smb5: Enable host mode VBUS handling for uUSB connector type

As per the new design the entity notifying extcon is expected to
enable/disable the VBUS in OTG mode, this applies for micro-USB and
non-PD typeC design where the PMIC drivers does the notification.

Add control to smb driver for enabling/disabling VBUS regulator on
host mode detection for uUSB and non-PD TypeC design.

Change-Id: I704982c6cab9b137a764ebaf6daa68f8f3de96da
Signed-off-by: Umang Agrawal <uagrawal@codeaurora.org>