USB: phy: msm: Turn off HSUSB vdd LDO on OTG suspend

Currently we keep voting for hsusb_vdd LDO on msm_otg_suspend.
As a result, LDO remains ON after suspend. Fix this by adding
disable and enable of the LDO during OTG suspend and resume
respectively.

Change-Id: Ifcd754df29fe8e67d42bad0dabc3f848497afdd8
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>