usb: dwc3-msm: Update timeout value for EP command

The previous timeout value was explained as being
based on trial and error. We saw a timeout
as high as 800[us]. In order to be on the safe-side,
the new timeout value is increased to allow such a
delay with room for error


Change-Id: I7bc953d9bd494b57dd5492b492d48b18994e6b8f
Signed-off-by: Dov Levenglick <dovl@codeaurora.org>