usb: dwc3: msm: change dbm ep reset assertion time

The necessary delay between asserting and deasserting the
dbm ep reset is based on thenumber of active endpoints.
If there is more than one endpoint,a 1 msec delay is required.
Otherwise, a shorter delay will suffice.

CRs-Fixed: 662695
Change-Id: Ic742e2ca58d5a5332c94b4fd642f80cfc13787f3
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>