usb: core: 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: Ie8d5231327fcc27ab2a28542e0d96687abb9aace
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>
Signed-off-by: Pratham Pratap <prathampratap@codeaurora.org>