usb: msm_otg: Fix error handling bug in driver probe

Driver probe is returning 0(success) in case of error
returned by APIs called in msm_otg_probe(). This is causing
NULL pointer exceptions during system wide suspend as
driver data for platform device is not set.

CRs-Fixed: 379532
Change-Id: I194e9386ba8de6d88ab102a467793f8b2f03083a
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>