usb: host: xhci: Replace msleep with usleep_range

Since usleep_range provides better accuracy in
comparison to msleep. This helps in reducing the
latency of host bus resume.

Change-Id: Id22104b9e5b63153731df9eb55759de9a86128c6
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>