qcom: smb138x: supsend USBIN and disable OTG before shutdown

SMB138X does not get reset when device restarts, so USBIN and OTG settings
will not be cleared. Reset them on PMIC shutdown, and restore in probe.

Disable OTG in early driver probe, because device may restart from WDOG
bite with OTG enabled.

CRs-Fixed: 2083638
Change-Id: I451d3e861ea28f89029fe8759599ac0e133baf11
Signed-off-by: Harry Yang <harryy@codeaurora.org>